[Feature] Aggiunto supporto completo OLE DB per connessione database

## Nuovi file
- DataConnection/DB/OleDbDatabaseManager.cs: Manager completo per connessioni OLE DB
  con supporto Task.Run() per operazioni sincrone, parametri posizionali '?',
  guard per piattaforma Windows, nessun supporto ChangeDatabaseAsync (no-op)
- DataConnection/DB/EF/SchemaProviders/OleDbSchemaProvider.cs: Schema provider per
  OLE DB, usa OleDbSchemaGuid per tabelle/colonne/chiavi primarie, mapping tipi dati
- CredentialManager/Services/OleDbProviderDiscoveryService.cs: Servizio di discovery
  provider OLE DB installati tramite registro Windows (HKEY_CLASSES_ROOT). Rileva
  9 provider noti: VFPOLEDB.1, Microsoft.ACE.OLEDB.12.0, Jet 4.0, SQLOLEDB, ecc.
  Mostra warning per provider solo 32-bit (VFPOLEDB, Jet)
- PUBLISH_32BIT_64BIT.md: Documentazione completa comandi pubblicazione per
  win-x64, win-x86 (richiesto per VFP), linux-x64, osx-x64, osx-arm64.
  Include prerequisiti VFPOLEDB, esempi connection string VFP, note Docker

## File modificati
- DataConnection/DB/Enums/DatabaseType.cs: Aggiunto valore OleDb dopo Odbc
- DataConnection/DataConnection.csproj: Aggiunto pacchetto System.Data.OleDb 9.0.3
- DataConnection/DB/OdbcDatabaseManager.cs: Fix bug ChangeDatabaseAsync con try-catch
- CredentialManager/Models/CredentialModels.cs: Aggiunto OleDb all'enum DatabaseType,
  BuildOleDbConnectionString() con supporto provider da AdditionalParameters,
  default VFPOLEDB.1, costruzione connection string con parametri VFP
- DataConnection/CredentialManagement/Models/CredentialExtensions.cs: Mappatura
  OleDb in ToDataConnectionDatabaseType() e ToCredentialDatabaseType()
- DataConnection/CredentialManagement/Services/DataConnectionCredentialService.cs:
  Aggiunto case OleDb in TestDatabaseConnectionAsync e metodo TestOleDbConnection()
  con apertura connessione via Task.Run() e gestione OleDbException dettagliata
- Data_Coupler/Services/DataConnectionFactory.cs: Aggiunto case OleDb per creazione
  OleDbDatabaseManager
- Data_Coupler/Program.cs: Registrazione IOleDbProviderDiscoveryService come Scoped
- Data_Coupler/Pages/CredentialManagement.razor: Aggiunta UI completa OLE DB con
  sezione dedicata Visual FoxPro (percorso .dbc/.dbf, Collating Sequence, DELETED),
  provider discovery con refresh, anteprima connection string, variabili di stato
  e metodi nel codice Blazor, sincronizzazione AdditionalParameters al salvataggio

## Compatibilità
- VFP 8.0/9.0: testato con VFPOLEDB.1, connessione file-based .dbc e .dbf
- Richiede pubblicazione win-x86 per driver OLE DB 32-bit
- AnyCPU non supportato per VFP (COM 32-bit)

CredentialManager/Models/CredentialModels.cs

@@ -55,7 +55,8 @@ public enum DatabaseType
     Sqlite,
     DB2,
     SapHana,
-    Odbc
+    Odbc,
+    OleDb
 }
 
 /// <summary>
@@ -194,6 +195,7 @@ public static class ConnectionStringBuilder
             DatabaseType.DB2 => BuildDb2ConnectionString(credential),
             DatabaseType.SapHana => BuildSapHanaConnectionString(credential),
             DatabaseType.Odbc => BuildOdbcConnectionString(credential),
+            DatabaseType.OleDb => BuildOleDbConnectionString(credential),
             _ => throw new NotSupportedException($"Database type {credential.DatabaseType} not supported")
         };
     }    private static string BuildSqlServerConnectionString(DatabaseCredential credential)
@@ -427,6 +429,47 @@ public static class ConnectionStringBuilder
         return string.Join(";", builder);
     }
 
+    private static string BuildOleDbConnectionString(DatabaseCredential credential)
+    {
+        // Se è già presente una connection string personalizzata, utilizzala
+        if (!string.IsNullOrEmpty(credential.ConnectionString))
+            return credential.ConnectionString;
+
+        var builder = new List<string>();
+
+        // Provider OLE DB (obbligatorio)
+        var provider = credential.AdditionalParameters?.GetValueOrDefault("Provider") ?? "VFPOLEDB.1";
+        builder.Add($"Provider={provider}");
+
+        // Data Source: per VFP e Access è il percorso file/cartella
+        // DatabaseName è il campo principale (come per SQLite)
+        var dataSource = !string.IsNullOrEmpty(credential.DatabaseName)
+            ? credential.DatabaseName
+            : credential.Host;
+
+        if (!string.IsNullOrEmpty(dataSource))
+            builder.Add($"Data Source={dataSource}");
+
+        // Credenziali (opzionali per VFP file-based)
+        if (!string.IsNullOrEmpty(credential.Username))
+            builder.Add($"User ID={credential.Username}");
+
+        if (!string.IsNullOrEmpty(credential.Password))
+            builder.Add($"Password={credential.Password}");
+
+        // Parametri aggiuntivi specifici (es. Collating Sequence, Exclusive, DELETED per VFP)
+        if (credential.AdditionalParameters != null)
+        {
+            foreach (var param in credential.AdditionalParameters)
+            {
+                if (param.Key != "Provider") // Provider già gestito sopra
+                    builder.Add($"{param.Key}={param.Value}");
+            }
+        }
+
+        return string.Join(";", builder);
+    }
+
     private static void AddAdditionalParameters(List<string> builder, Dictionary<string, string>? additionalParams)
     {
         if (additionalParams != null)

CredentialManager/Services/OleDbProviderDiscoveryService.cs

@@ -0,0 +1,112 @@
+using Microsoft.Extensions.Logging;
+using Microsoft.Win32;
+using System.Runtime.InteropServices;
+
+namespace CredentialManager.Services;
+
+/// <summary>
+/// Informazioni su un provider OLE DB installato nel sistema
+/// </summary>
+public class OleDbProviderInfo
+{
+    /// <summary>ProgID del provider (es. VFPOLEDB.1, Microsoft.ACE.OLEDB.12.0)</summary>
+    public string ProgId { get; set; } = string.Empty;
+
+    /// <summary>Descrizione leggibile del provider</summary>
+    public string Description { get; set; } = string.Empty;
+
+    /// <summary>Indica se è un provider Visual FoxPro (solo 32-bit)</summary>
+    public bool IsVfpProvider { get; set; }
+
+    /// <summary>Nota aggiuntiva (es. avviso 32-bit)</summary>
+    public string? Note { get; set; }
+}
+
+/// <summary>
+/// Interfaccia per il servizio di discovery dei provider OLE DB installati
+/// </summary>
+public interface IOleDbProviderDiscoveryService
+{
+    /// <summary>
+    /// Ottiene la lista dei provider OLE DB noti installati nel sistema
+    /// </summary>
+    List<OleDbProviderInfo> GetInstalledProviders();
+
+    /// <summary>
+    /// Verifica se almeno un provider Visual FoxPro è installato
+    /// </summary>
+    bool IsVfpProviderInstalled();
+}
+
+/// <summary>
+/// Servizio per la discovery dei provider OLE DB installati tramite il registro di Windows.
+/// Controlla un elenco di provider noti verificando la presenza della chiave HKEY_CLASSES_ROOT\{ProgId}.
+/// </summary>
+public class OleDbProviderDiscoveryService : IOleDbProviderDiscoveryService
+{
+    private readonly ILogger<OleDbProviderDiscoveryService> _logger;
+
+    /// <summary>
+    /// Provider OLE DB noti: ProgID → Descrizione
+    /// </summary>
+    private static readonly (string ProgId, string Description, bool IsVfp)[] KnownProviders =
+    {
+        ("VFPOLEDB.1",             "Microsoft OLE DB Provider per Visual FoxPro 8.0/9.0 (32-bit)", true),
+        ("VFPOLEDB",               "Microsoft OLE DB Provider per Visual FoxPro (32-bit)",         true),
+        ("Microsoft.ACE.OLEDB.12.0", "Microsoft Access Database Engine 2010",                     false),
+        ("Microsoft.ACE.OLEDB.16.0", "Microsoft Access Database Engine 2016",                     false),
+        ("Microsoft.Jet.OLEDB.4.0",  "Microsoft Jet 4.0 OLE DB Provider (Access/Excel 97-2003)", false),
+        ("SQLOLEDB",               "Microsoft OLE DB Provider for SQL Server (legacy)",            false),
+        ("SQLNCLI11",              "SQL Server Native Client 11.0",                                false),
+        ("MSOLEDBSQL",             "Microsoft OLE DB Driver for SQL Server",                       false),
+        ("MSDAORA",                "Microsoft OLE DB Provider for Oracle (legacy)",                false),
+    };
+
+    public OleDbProviderDiscoveryService(ILogger<OleDbProviderDiscoveryService> logger)
+    {
+        _logger = logger;
+    }
+
+    public List<OleDbProviderInfo> GetInstalledProviders()
+    {
+        var installed = new List<OleDbProviderInfo>();
+
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        {
+            _logger.LogWarning("OLE DB è supportato solo su Windows. Nessun provider restituito.");
+            return installed;
+        }
+
+        foreach (var (progId, description, isVfp) in KnownProviders)
+        {
+            try
+            {
+                using var key = Registry.ClassesRoot.OpenSubKey(progId);
+                if (key != null)
+                {
+                    var note = isVfp ? "⚠ Solo 32-bit — pubblicare con --runtime win-x86" : null;
+                    installed.Add(new OleDbProviderInfo
+                    {
+                        ProgId = progId,
+                        Description = description,
+                        IsVfpProvider = isVfp,
+                        Note = note
+                    });
+                    _logger.LogDebug("Provider OLE DB trovato: {ProgId}", progId);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogDebug("Errore nel verificare il provider {ProgId}: {Message}", progId, ex.Message);
+            }
+        }
+
+        _logger.LogInformation("Provider OLE DB installati trovati: {Count}", installed.Count);
+        return installed;
+    }
+
+    public bool IsVfpProviderInstalled()
+    {
+        return GetInstalledProviders().Any(p => p.IsVfpProvider);
+    }
+}

DataConnection/CredentialManagement/Models/CredentialExtensions.cs

@@ -22,6 +22,7 @@ public static class CredentialExtensions
             CredentialManager.Models.DatabaseType.DB2 => DataConnection.Enums.DatabaseType.DB2,
             CredentialManager.Models.DatabaseType.SapHana => DataConnection.Enums.DatabaseType.SapHana,
             CredentialManager.Models.DatabaseType.Odbc => DataConnection.Enums.DatabaseType.Odbc,
+            CredentialManager.Models.DatabaseType.OleDb => DataConnection.Enums.DatabaseType.OleDb,
             _ => throw new NotSupportedException($"Database type {credentialDbType} not supported")
         };
     }
@@ -41,6 +42,7 @@ public static class CredentialExtensions
             DataConnection.Enums.DatabaseType.DB2 => CredentialManager.Models.DatabaseType.DB2,
             DataConnection.Enums.DatabaseType.SapHana => CredentialManager.Models.DatabaseType.SapHana,
             DataConnection.Enums.DatabaseType.Odbc => CredentialManager.Models.DatabaseType.Odbc,
+            DataConnection.Enums.DatabaseType.OleDb => CredentialManager.Models.DatabaseType.OleDb,
             _ => throw new NotSupportedException($"Database type {dataConnectionDbType} not supported")
         };
     }

DataConnection/CredentialManagement/Services/DataConnectionCredentialService.cs

@@ -251,6 +251,7 @@ public class DataConnectionCredentialService : IDataConnectionCredentialService
                     CredentialManager.Models.DatabaseType.Oracle => await TestOracleConnection(connectionString, credential),
                     CredentialManager.Models.DatabaseType.Sqlite => await TestSqliteConnection(connectionString, credential),
                     CredentialManager.Models.DatabaseType.Odbc => await TestOdbcConnection(connectionString, credential),
+                    CredentialManager.Models.DatabaseType.OleDb => await TestOleDbConnection(connectionString, credential),
                     _ => (false, $"Test di connessione non implementato per {credential.DatabaseType}")
                 };
             }
@@ -404,6 +405,46 @@ public class DataConnectionCredentialService : IDataConnectionCredentialService
         }
     }
 
+    private async Task<(bool Success, string Message)> TestOleDbConnection(string connectionString, DatabaseCredential credential)
+    {
+        try
+        {
+            using var connection = new System.Data.OleDb.OleDbConnection(connectionString);
+            await Task.Run(() => connection.Open());
+
+            var details = new System.Text.StringBuilder();
+            details.AppendLine("Connessione OLE DB stabilita con successo!");
+            details.AppendLine();
+            details.AppendLine("Dettagli:");
+            details.AppendLine($"- Provider: {connection.Provider}");
+            if (!string.IsNullOrEmpty(connection.Database))
+                details.AppendLine($"- Database: {connection.Database}");
+            if (!string.IsNullOrEmpty(credential.DatabaseName))
+                details.AppendLine($"- Data Source: {credential.DatabaseName}");
+            details.AppendLine($"- Timeout: {credential.CommandTimeout}s");
+
+            return (true, details.ToString());
+        }
+        catch (System.Data.OleDb.OleDbException oleDbEx)
+        {
+            var errorDetails = new System.Text.StringBuilder();
+            errorDetails.AppendLine($"Errore OLE DB: {oleDbEx.Message}");
+            errorDetails.AppendLine();
+            errorDetails.AppendLine("Dettagli errori:");
+            foreach (System.Data.OleDb.OleDbError error in oleDbEx.Errors)
+            {
+                errorDetails.AppendLine($"- [{error.SQLState}] {error.Message}");
+                errorDetails.AppendLine($"  Source: {error.Source}");
+            }
+
+            return (false, errorDetails.ToString());
+        }
+        catch (Exception ex)
+        {
+            return (false, $"Errore OLE DB: {ex.Message}");
+        }
+    }
+
     public async Task<(bool Success, string Message)> TestRestApiConnectionAsync(string credentialName)
     {
         try

DataConnection/DB/EF/SchemaProviders/OleDbSchemaProvider.cs

@@ -0,0 +1,335 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.OleDb;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+using DataConnection.Interfaces;
+
+namespace DataConnection.EF.SchemaProviders;
+
+/// <summary>
+/// Provider di schema per database OLE DB (incluso Visual FoxPro)
+/// Utilizza GetOleDbSchemaTable per ottenere metadati in modo compatibile con VFP e altri provider OLE DB
+/// </summary>
+public class OleDbSchemaProvider : IDatabaseSchemaProvider
+{
+    public async Task<IDictionary<string, IEnumerable<DbColumnInfo>>> GetDatabaseSchemaAsync(string connectionString)
+    {
+        var result = new Dictionary<string, IEnumerable<DbColumnInfo>>();
+
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            throw new PlatformNotSupportedException("OLE DB è supportato solo su Windows.");
+
+        try
+        {
+            using var connection = new OleDbConnection(connectionString);
+            await Task.Run(() => connection.Open());
+
+            Console.WriteLine($"OLE DB Schema Provider - Provider: {connection.Provider}");
+
+            var tableNames = GetTableNamesFromConnection(connection);
+            Console.WriteLine($"Trovate {tableNames.Count} tabelle");
+
+            foreach (var tableName in tableNames)
+            {
+                try
+                {
+                    var columns = GetTableColumnsFromConnection(connection, tableName);
+                    if (columns.Any())
+                    {
+                        result[tableName] = columns;
+                        Console.WriteLine($"Tabella {tableName}: {columns.Count()} colonne");
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"Errore nel leggere le colonne della tabella {tableName}: {ex.Message}");
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Errore in OleDbSchemaProvider.GetDatabaseSchemaAsync: {ex.Message}");
+            throw;
+        }
+
+        return result;
+    }
+
+    public async Task<IEnumerable<string>> GetTableNamesAsync(string connectionString)
+    {
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            return Enumerable.Empty<string>();
+
+        try
+        {
+            using var connection = new OleDbConnection(connectionString);
+            await Task.Run(() => connection.Open());
+            return GetTableNamesFromConnection(connection);
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Errore in OleDbSchemaProvider.GetTableNamesAsync: {ex.Message}");
+            return Enumerable.Empty<string>();
+        }
+    }
+
+    public async Task<IEnumerable<DbColumnInfo>> GetTableSchemaAsync(string connectionString, string tableName)
+    {
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            return Enumerable.Empty<DbColumnInfo>();
+
+        try
+        {
+            using var connection = new OleDbConnection(connectionString);
+            await Task.Run(() => connection.Open());
+            return GetTableColumnsFromConnection(connection, tableName);
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Errore in OleDbSchemaProvider.GetTableSchemaAsync per {tableName}: {ex.Message}");
+            return Enumerable.Empty<DbColumnInfo>();
+        }
+    }
+
+    public async Task<IEnumerable<string>> GetAvailableDatabasesAsync(string connectionString)
+    {
+        // OLE DB file-based (VFP, Access) non supporta listing di database multipli
+        try
+        {
+            using var connection = new OleDbConnection(connectionString);
+            await Task.Run(() => connection.Open());
+            var db = connection.Database;
+            return string.IsNullOrEmpty(db) ? Enumerable.Empty<string>() : new[] { db };
+        }
+        catch
+        {
+            return Enumerable.Empty<string>();
+        }
+    }
+
+    private static List<string> GetTableNamesFromConnection(OleDbConnection connection)
+    {
+        var tableNames = new List<string>();
+
+        try
+        {
+            // Usa GetOleDbSchemaTable - più compatibile con VFP rispetto a GetSchema()
+            var restrictions = new object?[] { null, null, null, "TABLE" };
+            var tablesSchema = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, restrictions);
+
+            if (tablesSchema != null)
+            {
+                foreach (DataRow row in tablesSchema.Rows)
+                {
+                    var tableName = row["TABLE_NAME"]?.ToString();
+                    if (!string.IsNullOrEmpty(tableName))
+                        tableNames.Add(tableName);
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"GetOleDbSchemaTable Tables fallito, tentativo con GetSchema: {ex.Message}");
+
+            // Fallback a GetSchema per provider che non supportano GetOleDbSchemaTable
+            try
+            {
+                var tablesSchema = connection.GetSchema("Tables");
+                tableNames = tablesSchema.AsEnumerable()
+                    .Where(row =>
+                    {
+                        var t = row["TABLE_TYPE"]?.ToString();
+                        return t == "TABLE" || t == "BASE TABLE";
+                    })
+                    .Select(row => row["TABLE_NAME"]?.ToString() ?? string.Empty)
+                    .Where(n => !string.IsNullOrEmpty(n))
+                    .ToList();
+            }
+            catch (Exception ex2)
+            {
+                Console.WriteLine($"GetSchema Tables fallito anche: {ex2.Message}");
+            }
+        }
+
+        return tableNames.OrderBy(t => t).ToList();
+    }
+
+    private static List<DbColumnInfo> GetTableColumnsFromConnection(OleDbConnection connection, string tableName)
+    {
+        var columns = new List<DbColumnInfo>();
+
+        try
+        {
+            // Ottieni primary keys
+            var primaryKeys = GetPrimaryKeys(connection, tableName);
+
+            // Ottieni colonne via GetOleDbSchemaTable
+            var restrictions = new object?[] { null, null, tableName, null };
+            var columnsSchema = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, restrictions);
+
+            if (columnsSchema == null)
+                return columns;
+
+            // Ordina per posizione ordinale
+            var rows = columnsSchema.AsEnumerable()
+                .OrderBy(r => r.IsNull("ORDINAL_POSITION") ? 0 : Convert.ToInt32(r["ORDINAL_POSITION"]))
+                .ToList();
+
+            foreach (DataRow row in rows)
+            {
+                var columnName = row["COLUMN_NAME"]?.ToString();
+                if (string.IsNullOrEmpty(columnName))
+                    continue;
+
+                // DATA_TYPE è un int (OleDbType enum value)
+                int oleDbTypeInt = row.IsNull("DATA_TYPE") ? 0 : Convert.ToInt32(row["DATA_TYPE"]);
+                var dataType = MapOleDbTypeToString(oleDbTypeInt);
+
+                // Formato con dimensioni
+                var columnSize = row.IsNull("CHARACTER_MAXIMUM_LENGTH") ? 0 : Convert.ToInt32(row["CHARACTER_MAXIMUM_LENGTH"]);
+                var numericPrecision = row.IsNull("NUMERIC_PRECISION") ? 0 : Convert.ToInt32(row["NUMERIC_PRECISION"]);
+                var numericScale = row.IsNull("NUMERIC_SCALE") ? 0 : Convert.ToInt32(row["NUMERIC_SCALE"]);
+
+                var formattedType = FormatDataType(dataType, columnSize, numericPrecision, numericScale);
+
+                bool isNullable = true;
+                if (!row.IsNull("IS_NULLABLE"))
+                    isNullable = Convert.ToBoolean(row["IS_NULLABLE"]);
+
+                columns.Add(new DbColumnInfo
+                {
+                    Name = columnName,
+                    DataType = formattedType,
+                    IsNullable = isNullable,
+                    IsPrimaryKey = primaryKeys.Contains(columnName, StringComparer.OrdinalIgnoreCase)
+                });
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Errore nel recuperare le colonne per {tableName}: {ex.Message}");
+        }
+
+        return columns;
+    }
+
+    private static HashSet<string> GetPrimaryKeys(OleDbConnection connection, string tableName)
+    {
+        var primaryKeys = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+
+        try
+        {
+            var restrictions = new object?[] { null, null, tableName };
+            var pkSchema = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Primary_Keys, restrictions);
+
+            if (pkSchema != null)
+            {
+                foreach (DataRow row in pkSchema.Rows)
+                {
+                    var col = row["COLUMN_NAME"]?.ToString();
+                    if (!string.IsNullOrEmpty(col))
+                        primaryKeys.Add(col);
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Primary keys non disponibili per {tableName}: {ex.Message}");
+
+            // Fallback: prova con Indexes
+            try
+            {
+                var restrictions = new object?[] { null, null, null, null, tableName };
+                var idxSchema = connection.GetOleDbSchemaTable(OleDbSchemaGuid.Indexes, restrictions);
+
+                if (idxSchema != null)
+                {
+                    foreach (DataRow row in idxSchema.Rows)
+                    {
+                        if (row["PRIMARY_KEY"] is bool pk && pk)
+                        {
+                            var col = row["COLUMN_NAME"]?.ToString();
+                            if (!string.IsNullOrEmpty(col))
+                                primaryKeys.Add(col);
+                        }
+                    }
+                }
+            }
+            catch { /* Se anche questo fallisce, ignora */ }
+        }
+
+        return primaryKeys;
+    }
+
+    private static string MapOleDbTypeToString(int oleDbTypeInt)
+    {
+        // Mappa OleDbType enum (int) a nome leggibile
+        // https://learn.microsoft.com/en-us/dotnet/api/system.data.oledb.oledbtype
+        return oleDbTypeInt switch
+        {
+            2 => "SmallInt",
+            3 => "Integer",
+            4 => "Single",
+            5 => "Double",
+            6 => "Currency",
+            7 => "Date",
+            8 => "VarChar",      // BSTR
+            9 => "IDispatch",
+            10 => "Error",
+            11 => "Boolean",
+            12 => "Variant",
+            13 => "IUnknown",
+            14 => "Decimal",
+            16 => "TinyInt",
+            17 => "UnsignedTinyInt",
+            18 => "UnsignedSmallInt",
+            19 => "UnsignedInt",
+            20 => "BigInt",
+            21 => "UnsignedBigInt",
+            64 => "DateTime",
+            65 => "FileTime",
+            72 => "Guid",
+            128 => "Binary",
+            129 => "Char",
+            130 => "NVarChar",    // WChar
+            131 => "Decimal",    // Numeric
+            132 => "UserDefined",
+            133 => "Date",
+            134 => "Time",
+            135 => "DateTime",   // DBTimeStamp
+            136 => "Variant",    // Chapter
+            138 => "PropVariant",
+            139 => "VarNumeric",
+            200 => "VarChar",
+            201 => "LongVarChar",
+            202 => "NVarChar",   // VarWChar
+            203 => "NText",      // LongVarWChar
+            204 => "VarBinary",
+            205 => "Image",      // LongVarBinary
+            _ => $"Type({oleDbTypeInt})"
+        };
+    }
+
+    private static string FormatDataType(string dataType, int columnSize, int numericPrecision, int numericScale)
+    {
+        var upper = dataType.ToUpperInvariant();
+
+        if (upper.Contains("DECIMAL") || upper.Contains("NUMERIC"))
+        {
+            if (numericPrecision > 0)
+                return $"{dataType}({numericPrecision},{numericScale})";
+        }
+        else if (upper.Contains("CHAR") || upper.Contains("VARCHAR") || upper.Contains("TEXT") || upper.Contains("BINARY"))
+        {
+            if (columnSize > 0 && columnSize < 8000)
+                return $"{dataType}({columnSize})";
+            else if (columnSize >= 8000)
+                return $"{dataType}(MAX)";
+        }
+
+        return dataType;
+    }
+}

DataConnection/DB/Enums/DatabaseType.cs

@@ -12,5 +12,6 @@ public enum DatabaseType
     Sqlite,
     DB2,
     SapHana,
-    Odbc
+    Odbc,
+    OleDb
 }

DataConnection/DB/OdbcDatabaseManager.cs

@@ -66,11 +66,19 @@ public class OdbcDatabaseManager : IDatabaseManager
         using var connection = new OdbcConnection(_connectionString);
         await connection.OpenAsync();
 
-        // Cambia database se specificato
+        // Cambia database se specificato (alcuni driver come VFP non supportano ChangeDatabaseAsync)
         if (!string.IsNullOrEmpty(databaseName) && databaseName != _currentDatabase)
         {
-            await connection.ChangeDatabaseAsync(databaseName);
+            try
-            _currentDatabase = databaseName;
+            {
+                await connection.ChangeDatabaseAsync(databaseName);
+                _currentDatabase = databaseName;
+            }
+            catch (Exception dbChangeEx)
+            {
+                Console.WriteLine($"[ODBC] ChangeDatabaseAsync non supportato dal driver ({databaseName}): {dbChangeEx.Message}");
+                // Continua senza cambiare database (es. driver file-based come VFP)
+            }
         }
 
         using var command = new OdbcCommand(sql, connection);

DataConnection/DB/OleDbDatabaseManager.cs

@@ -0,0 +1,379 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.OleDb;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+using DataConnection.EF.SchemaProviders;
+using DataConnection.Interfaces;
+
+namespace DataConnection.DB;
+
+/// <summary>
+/// Database manager per connessioni OLE DB dirette (es. Visual FoxPro, Access, Jet)
+/// Nota: i driver OLE DB come VFPOLEDB.1 sono 32-bit only — pubblicare con --runtime win-x86 se necessario
+/// </summary>
+public class OleDbDatabaseManager : IDatabaseManager
+{
+    private readonly string _connectionString;
+    private readonly OleDbSchemaProvider _schemaProvider;
+
+    public OleDbDatabaseManager(string connectionString)
+    {
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            throw new PlatformNotSupportedException("OLE DB è supportato solo su Windows.");
+
+        _connectionString = connectionString ?? throw new ArgumentNullException(nameof(connectionString));
+        _schemaProvider = new OleDbSchemaProvider();
+    }
+
+    public async Task<bool> TestConnectionAsync()
+    {
+        try
+        {
+            using var connection = new OleDbConnection(_connectionString);
+            await Task.Run(() => connection.Open());
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    public Task<IEnumerable<T>> GetAsync<T>(
+        Expression<Func<T, bool>>? filter = null,
+        Func<IQueryable<T>, IOrderedQueryable<T>>? orderBy = null,
+        string includeProperties = "",
+        int? skip = null,
+        int? take = null) where T : class
+    {
+        throw new NotSupportedException("GetAsync<T> con espressioni LINQ non è supportato per OLE DB. Usare ExecuteRawQueryAsync.");
+    }
+
+    public Task<T?> GetByIdAsync<T>(object id) where T : class
+    {
+        throw new NotSupportedException("GetByIdAsync<T> non è supportato per OLE DB. Usare ExecuteRawQueryAsync con clausola WHERE.");
+    }
+
+    public Task<IEnumerable<T>> ExecuteQueryAsync<T>(string sql, params object[] parameters) where T : class
+    {
+        throw new NotSupportedException("ExecuteQueryAsync<T> non è supportato per OLE DB. Usare ExecuteRawQueryAsync.");
+    }
+
+    public async Task<List<Dictionary<string, object>>> ExecuteRawQueryAsync(string sql, string databaseName = "", params object[] parameters)
+    {
+        var results = new List<Dictionary<string, object>>();
+
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        // OLE DB file-based (VFP, Access) non supporta ChangeDatabaseAsync — il database è nel Data Source
+        // Ignoriamo databaseName per questa tipologia di provider
+
+        using var command = new OleDbCommand(sql, connection);
+
+        if (parameters != null && parameters.Length > 0)
+        {
+            for (int i = 0; i < parameters.Length; i++)
+            {
+                command.Parameters.Add(new OleDbParameter($"@p{i}", parameters[i] ?? DBNull.Value));
+            }
+        }
+
+        using var reader = await Task.Run(() => command.ExecuteReader());
+
+        while (reader.Read())
+        {
+            var row = new Dictionary<string, object>();
+            for (int i = 0; i < reader.FieldCount; i++)
+            {
+                var fieldName = reader.GetName(i);
+                var value = reader.IsDBNull(i) ? DBNull.Value : reader.GetValue(i);
+                row[fieldName] = value;
+            }
+            results.Add(row);
+        }
+
+        return results;
+    }
+
+    public async Task<int> ExecuteCommandAsync(string sql, params object[] parameters)
+    {
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var command = new OleDbCommand(sql, connection);
+
+        if (parameters != null && parameters.Length > 0)
+        {
+            for (int i = 0; i < parameters.Length; i++)
+            {
+                command.Parameters.Add(new OleDbParameter($"@p{i}", parameters[i] ?? DBNull.Value));
+            }
+        }
+
+        return await Task.Run(() => command.ExecuteNonQuery());
+    }
+
+    public async Task<List<string>> GetAvailableDatabasesAsync()
+    {
+        var databases = await _schemaProvider.GetAvailableDatabasesAsync(_connectionString);
+        return databases.ToList();
+    }
+
+    public async Task ChangeDatabaseAsync(string databaseName)
+    {
+        // I provider OLE DB file-based (VFP, Access) non supportano il cambio di database a runtime
+        // Il Data Source nella connection string definisce il database
+        Console.WriteLine($"[OleDb] ChangeDatabaseAsync ignorato per provider file-based (database: {databaseName})");
+        await Task.CompletedTask;
+    }
+
+    public async Task<IDictionary<string, IEnumerable<DbColumnInfo>>> GetDatabaseSchemaAsync()
+    {
+        return await _schemaProvider.GetDatabaseSchemaAsync(_connectionString);
+    }
+
+    public async Task<IEnumerable<string>> GetTableNamesAsync()
+    {
+        return await _schemaProvider.GetTableNamesAsync(_connectionString);
+    }
+
+    public async Task<IEnumerable<DbColumnInfo>> GetTableSchemaAsync(string tableName)
+    {
+        return await _schemaProvider.GetTableSchemaAsync(_connectionString, tableName);
+    }
+
+    public async Task<IEnumerable<Dictionary<string, object>>> GetAllRecordsAsync(string tableName)
+    {
+        var query = $"SELECT * FROM {tableName}";
+        return await ExecuteRawQueryAsync(query);
+    }
+
+    public async Task<string?> GetPrimaryKeyFieldAsync(string tableName)
+    {
+        try
+        {
+            var schema = await GetTableSchemaAsync(tableName);
+            var pkColumn = schema.FirstOrDefault(c => c.IsPrimaryKey);
+            return pkColumn?.Name;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public async Task<IEnumerable<IDictionary<string, object?>>> ExecuteQueryAsync(string query, int? maxRows = null)
+    {
+        var results = new List<IDictionary<string, object?>>();
+
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        var commandText = maxRows.HasValue ? WrapQueryWithLimit(query, maxRows.Value) : query;
+        using var command = new OleDbCommand(commandText, connection);
+
+        using var reader = await Task.Run(() => command.ExecuteReader());
+
+        while (reader.Read())
+        {
+            var row = new Dictionary<string, object?>();
+            for (int i = 0; i < reader.FieldCount; i++)
+            {
+                var fieldName = reader.GetName(i);
+                var value = reader.IsDBNull(i) ? null : reader.GetValue(i);
+                row[fieldName] = value;
+            }
+            results.Add(row);
+        }
+
+        return results;
+    }
+
+    public async Task<int> ExecuteNonQueryAsync(string query)
+    {
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var command = new OleDbCommand(query, connection);
+        return await Task.Run(() => command.ExecuteNonQuery());
+    }
+
+    public async Task<object?> ExecuteScalarAsync(string query)
+    {
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var command = new OleDbCommand(query, connection);
+        return await Task.Run(() => command.ExecuteScalar());
+    }
+
+    public async Task<int> InsertAsync(string tableName, IDictionary<string, object?> data)
+    {
+        var columns = string.Join(", ", data.Keys.Select(k => $"[{k}]"));
+        var parameters = string.Join(", ", data.Keys.Select(_ => "?"));
+
+        var query = $"INSERT INTO {tableName} ({columns}) VALUES ({parameters})";
+
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var command = new OleDbCommand(query, connection);
+
+        foreach (var value in data.Values)
+            command.Parameters.Add(new OleDbParameter { Value = value ?? DBNull.Value });
+
+        return await Task.Run(() => command.ExecuteNonQuery());
+    }
+
+    public async Task<int> UpdateAsync(string tableName, IDictionary<string, object?> data, IDictionary<string, object?> whereClause)
+    {
+        var setClause = string.Join(", ", data.Keys.Select(k => $"[{k}] = ?"));
+        var whereConditions = string.Join(" AND ", whereClause.Keys.Select(k => $"[{k}] = ?"));
+
+        var query = $"UPDATE {tableName} SET {setClause} WHERE {whereConditions}";
+
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var command = new OleDbCommand(query, connection);
+
+        foreach (var value in data.Values)
+            command.Parameters.Add(new OleDbParameter { Value = value ?? DBNull.Value });
+
+        foreach (var value in whereClause.Values)
+            command.Parameters.Add(new OleDbParameter { Value = value ?? DBNull.Value });
+
+        return await Task.Run(() => command.ExecuteNonQuery());
+    }
+
+    public async Task<int> DeleteAsync(string tableName, IDictionary<string, object?> whereClause)
+    {
+        var whereConditions = string.Join(" AND ", whereClause.Keys.Select(k => $"[{k}] = ?"));
+        var query = $"DELETE FROM {tableName} WHERE {whereConditions}";
+
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var command = new OleDbCommand(query, connection);
+
+        foreach (var value in whereClause.Values)
+            command.Parameters.Add(new OleDbParameter { Value = value ?? DBNull.Value });
+
+        return await Task.Run(() => command.ExecuteNonQuery());
+    }
+
+    public async Task<int> BulkInsertAsync(string tableName, IEnumerable<IDictionary<string, object?>> dataList)
+    {
+        int totalInserted = 0;
+
+        using var connection = new OleDbConnection(_connectionString);
+        await Task.Run(() => connection.Open());
+
+        using var transaction = connection.BeginTransaction();
+
+        try
+        {
+            foreach (var data in dataList)
+            {
+                var columns = string.Join(", ", data.Keys.Select(k => $"[{k}]"));
+                var parameters = string.Join(", ", data.Keys.Select(_ => "?"));
+
+                var query = $"INSERT INTO {tableName} ({columns}) VALUES ({parameters})";
+
+                using var command = new OleDbCommand(query, connection, transaction);
+
+                foreach (var value in data.Values)
+                    command.Parameters.Add(new OleDbParameter { Value = value ?? DBNull.Value });
+
+                totalInserted += await Task.Run(() => command.ExecuteNonQuery());
+            }
+
+            transaction.Commit();
+        }
+        catch
+        {
+            transaction.Rollback();
+            throw;
+        }
+
+        return totalInserted;
+    }
+
+    public async Task<bool> UpsertRecordAsync(string tableName, string keyField, object? keyValue, Dictionary<string, object?> record)
+    {
+        try
+        {
+            using var connection = new OleDbConnection(_connectionString);
+            await Task.Run(() => connection.Open());
+
+            using var checkCmd = new OleDbCommand($"SELECT COUNT(*) FROM {tableName} WHERE [{keyField}] = ?", connection);
+            checkCmd.Parameters.Add(new OleDbParameter { Value = keyValue ?? DBNull.Value });
+
+            var countResult = await Task.Run(() => checkCmd.ExecuteScalar());
+            bool exists = Convert.ToInt64(countResult ?? 0L) > 0;
+
+            if (exists)
+            {
+                var fields = record.Keys.ToList();
+                var setClauses = fields.Select(f => $"[{f}] = ?").ToList();
+                var updateSql = $"UPDATE {tableName} SET {string.Join(", ", setClauses)} WHERE [{keyField}] = ?";
+
+                using var updateCmd = new OleDbCommand(updateSql, connection);
+
+                foreach (var f in fields)
+                    updateCmd.Parameters.Add(new OleDbParameter { Value = record[f] ?? DBNull.Value });
+
+                updateCmd.Parameters.Add(new OleDbParameter { Value = keyValue ?? DBNull.Value });
+
+                await Task.Run(() => updateCmd.ExecuteNonQuery());
+            }
+            else
+            {
+                var fields = record.Keys.ToList();
+                var fieldNames = string.Join(", ", fields.Select(f => $"[{f}]"));
+                var paramPlaceholders = string.Join(", ", fields.Select(_ => "?"));
+                var insertSql = $"INSERT INTO {tableName} ({fieldNames}) VALUES ({paramPlaceholders})";
+
+                using var insertCmd = new OleDbCommand(insertSql, connection);
+
+                foreach (var f in fields)
+                    insertCmd.Parameters.Add(new OleDbParameter { Value = record[f] ?? DBNull.Value });
+
+                await Task.Run(() => insertCmd.ExecuteNonQuery());
+            }
+
+            return true;
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Errore nell'upsert OLE DB in {tableName}: {ex.Message}");
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// VFP e la maggior parte dei provider OLE DB supportano SELECT TOP N (SQL Server style)
+    /// </summary>
+    private static string WrapQueryWithLimit(string query, int maxRows)
+    {
+        var upperQuery = query.Trim().ToUpperInvariant();
+
+        if (upperQuery.Contains("LIMIT ") || upperQuery.Contains("TOP "))
+            return query;
+
+        if (upperQuery.StartsWith("SELECT "))
+            return query.Insert(7, $"TOP {maxRows} ");
+
+        return $"{query} LIMIT {maxRows}";
+    }
+
+    public void Dispose()
+    {
+        // Nessuna risorsa da rilasciare
+    }
+}

DataConnection/DataConnection.csproj

@@ -17,6 +17,7 @@
     <PackageReference Include="Microsoft.Data.Sqlite" Version="9.0.3" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.10" />
     <PackageReference Include="System.Data.Odbc" Version="9.0.3" />
+    <PackageReference Include="System.Data.OleDb" Version="9.0.3" />
   </ItemGroup>
 
   <ItemGroup>

Data_Coupler/Pages/CredentialManagement.razor

@@ -8,6 +8,7 @@
 @using Microsoft.JSInterop
 @inject IDataConnectionCredentialService CredentialService
 @inject IOdbcDsnDiscoveryService OdbcDsnDiscoveryService
+@inject IOleDbProviderDiscoveryService OleDbProviderDiscoveryService
 @inject IJSRuntime JSRuntime
 @inject NavigationManager Navigation
 
@@ -242,6 +243,7 @@ else
                                         <option value="@CredentialManager.Models.DatabaseType.DB2">DB2</option> 
                                         <option value="@CredentialManager.Models.DatabaseType.SapHana">SAP HANA</option>*@
                                         <option value="@CredentialManager.Models.DatabaseType.Odbc">ODBC</option>
+                                        <option value="@CredentialManager.Models.DatabaseType.OleDb">OLE DB</option>
                                     </InputSelect>
                                 </div>
                             </div>
@@ -465,6 +467,148 @@ else
                                 </div>
                             </div>
                         }
+                        else if (currentDatabaseCredential.DatabaseType == CredentialManager.Models.DatabaseType.OleDb)
+                        {
+                            <!-- Configurazione OLE DB -->
+                            <div class="card mb-3">
+                                <div class="card-header bg-warning text-dark">
+                                    <h6 class="mb-0"><i class="oi oi-link-intact"></i> Configurazione OLE DB</h6>
+                                </div>
+                                <div class="card-body">
+                                    <div class="alert alert-danger py-2">
+                                        <i class="oi oi-warning"></i> <strong>Attenzione — Compatibilità 32-bit:</strong>
+                                        Driver come <strong>VFPOLEDB.1</strong> (Visual FoxPro) sono <strong>esclusivamente 32-bit</strong>.
+                                        Pubblica l'applicazione con <code>dotnet publish --runtime win-x86</code>.
+                                        Vedi <strong>PUBLISH_32BIT_64BIT.md</strong> per tutti i dettagli.
+                                    </div>
+
+                                    <div class="mb-3">
+                                        <label class="form-label">
+                                            Provider OLE DB *
+                                            <button type="button" class="btn btn-sm btn-outline-secondary ms-2" @onclick="RefreshOleDbProviderList">
+                                                <i class="oi oi-reload"></i> Aggiorna Lista
+                                            </button>
+                                        </label>
+                                        @if (availableOleDbProviders.Any())
+                                        {
+                                            <select class="form-select" @bind="selectedOleDbProvider">
+                                                <option value="">-- Seleziona Provider --</option>
+                                                @foreach (var prov in availableOleDbProviders)
+                                                {
+                                                    <option value="@prov.ProgId">@prov.ProgId — @prov.Description</option>
+                                                }
+                                            </select>
+                                            @if (!string.IsNullOrEmpty(selectedOleDbProvider))
+                                            {
+                                                var info = availableOleDbProviders.FirstOrDefault(p => p.ProgId == selectedOleDbProvider);
+                                                if (info?.Note != null)
+                                                {
+                                                    <div class="alert alert-warning mt-2 py-2 small">
+                                                        <i class="oi oi-warning"></i> @info.Note
+                                                    </div>
+                                                }
+                                            }
+                                        }
+                                        else
+                                        {
+                                            <div class="alert alert-info py-2 small">
+                                                <i class="oi oi-info"></i> Nessun provider OLE DB rilevato automaticamente.
+                                                Potrebbe essere necessario eseguire in modalità 32-bit. Inserisci manualmente il ProgID:
+                                            </div>
+                                        }
+                                        <InputText class="form-control mt-1" @bind-Value="selectedOleDbProvider"
+                                                   placeholder="es. VFPOLEDB.1, Microsoft.ACE.OLEDB.12.0, Microsoft.Jet.OLEDB.4.0" />
+                                        <small class="form-text text-muted">
+                                            Provider comuni: <code>VFPOLEDB.1</code> (VFP), <code>Microsoft.ACE.OLEDB.12.0</code> (Access/Excel), <code>Microsoft.Jet.OLEDB.4.0</code> (Access 97-2003)
+                                        </small>
+                                    </div>
+
+                                    @if (IsVfpProvider())
+                                    {
+                                        <!-- Sezione specifica Visual FoxPro -->
+                                        <div class="mb-3">
+                                            <label class="form-label">Percorso Database VFP * <small class="text-muted">(.dbc o cartella .dbf)</small></label>
+                                            <InputText class="form-control font-monospace"
+                                                       @bind-Value="currentDatabaseCredential.DatabaseName"
+                                                       placeholder="es. C:\VFP\Database\miodb.dbc oppure C:\VFP\Tabelle\" />
+                                            <small class="form-text text-muted">
+                                                Per database container (<code>.dbc</code>): percorso completo al file.<br />
+                                                Per tabelle free (<code>.dbf</code>): percorso della cartella contenente i file.
+                                            </small>
+                                        </div>
+                                        <div class="row">
+                                            <div class="col-md-6">
+                                                <div class="mb-3">
+                                                    <label class="form-label">Collating Sequence</label>
+                                                    <select class="form-select" @bind="oleDbCollatingSequence">
+                                                        <option value="">-- Default (machine) --</option>
+                                                        <option value="machine">machine</option>
+                                                        <option value="general">general</option>
+                                                        <option value="spanish">spanish</option>
+                                                        <option value="dutch">dutch</option>
+                                                        <option value="french">french</option>
+                                                        <option value="german">german</option>
+                                                        <option value="italian">italian</option>
+                                                    </select>
+                                                </div>
+                                            </div>
+                                            <div class="col-md-6">
+                                                <div class="mb-3">
+                                                    <label class="form-label">Record Cancellati (DELETED)</label>
+                                                    <select class="form-select" @bind="oleDbDeleted">
+                                                        <option value="">-- Default (ON) --</option>
+                                                        <option value="ON">ON — escludi record cancellati</option>
+                                                        <option value="OFF">OFF — includi record cancellati</option>
+                                                    </select>
+                                                </div>
+                                            </div>
+                                        </div>
+                                        <div class="row">
+                                            <div class="col-md-6">
+                                                <div class="mb-3">
+                                                    <label class="form-label">Username <small class="text-muted">(raramente richiesto per VFP)</small></label>
+                                                    <InputText class="form-control" @bind-Value="currentDatabaseCredential.Username" placeholder="Opzionale" />
+                                                </div>
+                                            </div>
+                                            <div class="col-md-6">
+                                                <div class="mb-3">
+                                                    <label class="form-label">Password <small class="text-muted">(raramente richiesta per VFP)</small></label>
+                                                    <InputText type="password" class="form-control" @bind-Value="currentDatabaseCredential.Password" placeholder="Opzionale" />
+                                                </div>
+                                            </div>
+                                        </div>
+                                    }
+                                    else
+                                    {
+                                        <div class="mb-3">
+                                            <label class="form-label">Data Source <small class="text-muted">(percorso file o server)</small></label>
+                                            <InputText class="form-control" @bind-Value="currentDatabaseCredential.DatabaseName"
+                                                       placeholder="es. C:\Access\miodb.accdb oppure server\database" />
+                                        </div>
+                                        <div class="row">
+                                            <div class="col-md-6">
+                                                <div class="mb-3">
+                                                    <label class="form-label">Username</label>
+                                                    <InputText class="form-control" @bind-Value="currentDatabaseCredential.Username" placeholder="Opzionale" />
+                                                </div>
+                                            </div>
+                                            <div class="col-md-6">
+                                                <div class="mb-3">
+                                                    <label class="form-label">Password</label>
+                                                    <InputText type="password" class="form-control" @bind-Value="currentDatabaseCredential.Password" placeholder="Opzionale" />
+                                                </div>
+                                            </div>
+                                        </div>
+                                    }
+
+                                    <div class="mb-3">
+                                        <label class="form-label">Anteprima Connection String</label>
+                                        <textarea class="form-control font-monospace" rows="3" readonly>@GetOleDbConnectionStringPreview()</textarea>
+                                        <small class="form-text text-muted">Anteprima della connection string che verrà generata</small>
+                                    </div>
+                                </div>
+                            </div>
+                        }
                         else
                         {
                             <!-- Configurazione Standard Database -->
@@ -885,6 +1029,12 @@ else
     private string selectedOdbcDriver = string.Empty;
     private bool loadingOdbcData = false;
 
+    // OLE DB specific state
+    private List<OleDbProviderInfo> availableOleDbProviders = new();
+    private string selectedOleDbProvider = string.Empty;
+    private string oleDbCollatingSequence = string.Empty;
+    private string oleDbDeleted = string.Empty;
+
     protected override async Task OnInitializedAsync()
     {        await RefreshCredentials();
         CheckForProblematicCredentials();
@@ -931,6 +1081,11 @@ else
         {
             await LoadOdbcData();
         }
+        // Se è OLE DB, carica i provider
+        if (currentDatabaseCredential.DatabaseType == DatabaseType.OleDb)
+        {
+            LoadOleDbData();
+        }
     }
 
     private async Task EditDatabaseCredential(DatabaseCredential credential)
@@ -963,6 +1118,19 @@ else
                 selectedOdbcDriver = currentDatabaseCredential.AdditionalParameters["Driver"];
             }
         }
+        // Se è OLE DB, carica i provider e ripristina il provider selezionato
+        if (currentDatabaseCredential.DatabaseType == DatabaseType.OleDb)
+        {
+            LoadOleDbData();
+            if (currentDatabaseCredential.AdditionalParameters?.ContainsKey("Provider") == true)
+            {
+                selectedOleDbProvider = currentDatabaseCredential.AdditionalParameters["Provider"];
+            }
+            if (currentDatabaseCredential.AdditionalParameters?.ContainsKey("Collating Sequence") == true)
+                oleDbCollatingSequence = currentDatabaseCredential.AdditionalParameters["Collating Sequence"];
+            if (currentDatabaseCredential.AdditionalParameters?.ContainsKey("DELETED") == true)
+                oleDbDeleted = currentDatabaseCredential.AdditionalParameters["DELETED"];
+        }
         
         showDatabaseModal = true;
     }
@@ -971,6 +1139,22 @@ else
     {
         try
         {
+            // Sincronizza i parametri OLE DB negli AdditionalParameters prima del salvataggio
+            if (currentDatabaseCredential.DatabaseType == DatabaseType.OleDb)
+            {
+                currentDatabaseCredential.AdditionalParameters ??= new Dictionary<string, string>();
+                if (!string.IsNullOrEmpty(selectedOleDbProvider))
+                    currentDatabaseCredential.AdditionalParameters["Provider"] = selectedOleDbProvider;
+                if (!string.IsNullOrEmpty(oleDbCollatingSequence))
+                    currentDatabaseCredential.AdditionalParameters["Collating Sequence"] = oleDbCollatingSequence;
+                else
+                    currentDatabaseCredential.AdditionalParameters.Remove("Collating Sequence");
+                if (!string.IsNullOrEmpty(oleDbDeleted))
+                    currentDatabaseCredential.AdditionalParameters["DELETED"] = oleDbDeleted;
+                else
+                    currentDatabaseCredential.AdditionalParameters.Remove("DELETED");
+            }
+
             await CredentialService.SaveDatabaseCredentialAsync(currentDatabaseCredential);
             await JSRuntime.InvokeVoidAsync("alert", "Credenziale database salvata con successo!");
             CloseDatabaseModal();
@@ -1289,6 +1473,64 @@ else
         StateHasChanged();
     }
 
+    // OLE DB Methods
+
+    private void LoadOleDbData()
+    {
+        try
+        {
+            availableOleDbProviders = OleDbProviderDiscoveryService.GetInstalledProviders();
+        }
+        catch
+        {
+            availableOleDbProviders = new List<OleDbProviderInfo>();
+        }
+    }
+
+    private void RefreshOleDbProviderList()
+    {
+        LoadOleDbData();
+        StateHasChanged();
+    }
+
+    private bool IsVfpProvider()
+    {
+        if (string.IsNullOrEmpty(selectedOleDbProvider))
+            return false;
+        return selectedOleDbProvider.StartsWith("VFPOLEDB", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private string GetOleDbConnectionStringPreview()
+    {
+        if (currentDatabaseCredential.DatabaseType != DatabaseType.OleDb)
+            return string.Empty;
+
+        try
+        {
+            // Copia i parametri OLE DB nei AdditionalParameters temporaneamente
+            currentDatabaseCredential.AdditionalParameters ??= new Dictionary<string, string>();
+
+            if (!string.IsNullOrEmpty(selectedOleDbProvider))
+                currentDatabaseCredential.AdditionalParameters["Provider"] = selectedOleDbProvider;
+
+            if (!string.IsNullOrEmpty(oleDbCollatingSequence))
+                currentDatabaseCredential.AdditionalParameters["Collating Sequence"] = oleDbCollatingSequence;
+            else
+                currentDatabaseCredential.AdditionalParameters.Remove("Collating Sequence");
+
+            if (!string.IsNullOrEmpty(oleDbDeleted))
+                currentDatabaseCredential.AdditionalParameters["DELETED"] = oleDbDeleted;
+            else
+                currentDatabaseCredential.AdditionalParameters.Remove("DELETED");
+
+            return ConnectionStringBuilder.BuildConnectionString(currentDatabaseCredential);
+        }
+        catch (Exception ex)
+        {
+            return $"Errore nella generazione: {ex.Message}";
+        }
+    }
+
     #endregion
 
     #endregion

Data_Coupler/Program.cs

@@ -109,6 +109,7 @@ builder.Services.AddScoped<IDataConnectionFactory, DataConnectionFactory>();
 
 // Register ODBC DSN Discovery Service
 builder.Services.AddScoped<CredentialManager.Services.IOdbcDsnDiscoveryService, CredentialManager.Services.OdbcDsnDiscoveryService>();
+builder.Services.AddScoped<CredentialManager.Services.IOleDbProviderDiscoveryService, CredentialManager.Services.OleDbProviderDiscoveryService>();
 
 // Register Association Service (Pre-Discovery)
 builder.Services.AddScoped<Data_Coupler.Services.IAssociationService, Data_Coupler.Services.AssociationService>();

Data_Coupler/Services/DataConnectionFactory.cs

@@ -83,6 +83,14 @@ namespace Data_Coupler.Services
                     return new DataConnection.DB.OdbcDatabaseManager(connectionString);
                 }
 
+                // Per OLE DB, usa OleDbDatabaseManager direttamente (EF Core non supporta OLE DB)
+                if (credential.DatabaseType == DatabaseType.OleDb)
+                {
+                    var connectionString = CredentialManager.Models.ConnectionStringBuilder.BuildConnectionString(credential);
+                    _logger.LogInformation("Creando OleDbDatabaseManager con connection string per {CredentialName}", credentialName);
+                    return new DataConnection.DB.OleDbDatabaseManager(connectionString);
+                }
+
                 // Per altri database, usa EFCoreDatabaseManager
                 var dbManagerOptions = await _credentialService.GetDbManagerOptionsAsync(credential.Name);
                 return new EFCoreDatabaseManager(dbManagerOptions);

PUBLISH_32BIT_64BIT.md

@@ -0,0 +1,164 @@
+# Pubblicazione Data-Coupler: Guida 32-bit e 64-bit
+
+## Perché è importante scegliere la piattaforma target
+
+Alcune tecnologie di connessione sono vincolate alla piattaforma (32-bit o 64-bit):
+
+| Tecnologia | Supporto | Note |
+|---|---|---|
+| **VFPOLEDB.1** (Visual FoxPro) | **Solo 32-bit** | Driver COM 32-bit, incompatibile con processi 64-bit |
+| **Microsoft.ACE.OLEDB.12.0** (Access 2010) | 32-bit o 64-bit (match) | Installa la versione corrispondente all'app |
+| **Microsoft.Jet.OLEDB.4.0** | **Solo 32-bit** | Driver legacy |
+| ODBC generico | Dipende dal driver | Usa Gestore ODBC a 64-bit per driver 64-bit |
+| SQL Server, MySQL, PostgreSQL, ecc. | 64-bit (consigliato) | Driver nativi .NET, nessun vincolo |
+
+---
+
+## Comandi di Pubblicazione
+
+### 1. Pubblicazione Windows 64-bit (default, consigliato per SQL Server/MySQL/API REST)
+
+```powershell
+dotnet publish Data_Coupler/Data_Coupler.csproj `
+  --configuration Release `
+  --runtime win-x64 `
+  --self-contained true `
+  --output ./publish/win-x64
+```
+
+**Usa per**: SQL Server, MySQL, PostgreSQL, Oracle, REST API, ODBC 64-bit  
+**Non usare per**: VFPOLEDB, Jet 4.0
+
+---
+
+### 2. Pubblicazione Windows 32-bit (richiesta per Visual FoxPro / VFPOLEDB)
+
+```powershell
+dotnet publish Data_Coupler/Data_Coupler.csproj `
+  --configuration Release `
+  --runtime win-x86 `
+  --self-contained true `
+  --output ./publish/win-x86
+```
+
+**Usa per**: VFPOLEDB.1 (Visual FoxPro 8/9), Microsoft.Jet.OLEDB.4.0, driver OLE DB legacy 32-bit  
+**Nota**: Il processo sarà 32-bit — massima RAM ≈ 4GB.
+
+---
+
+### 3. Pubblicazione Linux x64
+
+```powershell
+dotnet publish Data_Coupler/Data_Coupler.csproj `
+  --configuration Release `
+  --runtime linux-x64 `
+  --self-contained true `
+  --output ./publish/linux-x64
+```
+
+**Attenzione**: OLE DB e ODBC (drivers Windows) **non sono supportati** su Linux.  
+Su Linux sono disponibili solo: SQL Server, MySQL, PostgreSQL, Oracle, SQLite, DB2, SAP HANA, REST API.
+
+---
+
+### 4. Pubblicazione macOS (Intel)
+
+```powershell
+dotnet publish Data_Coupler/Data_Coupler.csproj `
+  --configuration Release `
+  --runtime osx-x64 `
+  --self-contained true `
+  --output ./publish/osx-x64
+```
+
+---
+
+### 5. Pubblicazione macOS (Apple Silicon - ARM64)
+
+```powershell
+dotnet publish Data_Coupler/Data_Coupler.csproj `
+  --configuration Release `
+  --runtime osx-arm64 `
+  --self-contained true `
+  --output ./publish/osx-arm64
+```
+
+---
+
+## Pubblicazione Framework-Dependent (senza runtime incluso)
+
+Se .NET 9 è già installato sul server target:
+
+```powershell
+# Windows (framework-dependent, lascia a .NET la scelta della bitness)
+dotnet publish Data_Coupler/Data_Coupler.csproj `
+  --configuration Release `
+  --output ./publish/framework-dependent
+
+# Forzare 32-bit anche in framework-dependent (per VFP):
+# Compilare il progetto con PlatformTarget = x86 o usare --runtime win-x86
+```
+
+---
+
+## Setup per Visual FoxPro (VFPOLEDB.1)
+
+### Prerequisiti
+
+1. **Driver VFPOLEDB installato** (32-bit):
+   - Download: [Microsoft OLE DB Provider for Visual FoxPro 9.0 SP2](https://www.microsoft.com/en-us/download/details.aspx?id=14839)
+   - Verifica installazione: `HKEY_CLASSES_ROOT\VFPOLEDB.1` deve esistere nel registro
+
+2. **Applicazione pubblicata come 32-bit** (`--runtime win-x86`)
+
+3. **Connection string esempio VFP**:
+   ```
+   Provider=VFPOLEDB.1;Data Source=C:\VFP\Database\miodb.dbc;Collating Sequence=machine;
+   ```
+   Per tabelle free (.dbf):
+   ```
+   Provider=VFPOLEDB.1;Data Source=C:\VFP\Tabelle\;Collating Sequence=machine;
+   ```
+
+### Verifica Rapida in PowerShell
+
+```powershell
+# Verifica driver VFP installato
+Get-Item "HKCR:\VFPOLEDB.1" -ErrorAction SilentlyContinue
+
+# Verifica processo 32-bit in esecuzione
+[System.Environment]::Is64BitProcess  # deve restituire False
+```
+
+---
+
+## Docker
+
+Per Docker con VFP (non consigliato — driver COM Windows-only):
+
+```dockerfile
+# Nel Dockerfile, non è possibile usare VFPOLEDB su Linux container
+# Usare Windows Container (opzione Dockerfile.windows)
+```
+
+Per **Windows Container** con supporto 32-bit, modifica il `Dockerfile.windows`:
+
+```dockerfile
+# Usa immagine Windows nano server
+FROM mcr.microsoft.com/windows/nanoserver:ltsc2022
+
+# Copia publish win-x86
+COPY ./publish/win-x86 /app
+```
+
+---
+
+## Riepilogo Rapido
+
+| Scenario | Comando |
+|---|---|
+| Solo database SQL + REST API | `--runtime win-x64` |
+| Visual FoxPro / OLE DB legacy | `--runtime win-x86` |
+| Server Linux | `--runtime linux-x64` |
+| macOS Intel | `--runtime osx-x64` |
+| macOS Apple Silicon | `--runtime osx-arm64` |