Download Microsoft Access Database Engine 2010 Redistributable 32 Bit Page

HKEY_CLASSES_ROOT\CLSID\3BE786A0-0366-4F5C-8FB8-95E3565CAF27 If present, the driver is ready. | Tool / Language | Connection string example | |----------------|---------------------------| | Python (pandas) | engine='access' or conn_str = r"DRIVER=Microsoft Access Driver (*.mdb, *.accdb);DBQ=C:\data\file.accdb" | | PowerShell | $conn = New-Object System.Data.OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\data\file.xlsx;Extended Properties='Excel 12.0 Xml;HDR=YES'") | | SQL Server (Linked Server) | Provider = 'Microsoft.ACE.OLEDB.12.0'; Data Source = 'C:\data\file.accdb' | | C# / .NET | @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\data\file.xlsx;Extended Properties=""Excel 12.0 Xml;HDR=YES""" | Troubleshooting tips ❌ “The ‘Microsoft.ACE.OLEDB.12.0’ provider is not registered” → You installed the 64-bit version, but your app is 32-bit (or vice versa). Reinstall the 32-bit driver using /quiet if needed.

🔗 https://www.microsoft.com/en-us/download/details.aspx?id=13255 🔗 https://www

Look for the file named: (that’s the 32-bit version) The 64-bit version is named AccessDatabaseEngine_x64.exe . Do not grab that unless you are 100% sure your toolchain supports 64-bit ACE. Step 2: Install normally (with one big exception) Run AccessDatabaseEngine.exe . The default install is straightforward. The default install is straightforward

For 99% of mixed-environment scenarios (32-bit scripts + 64-bit Office), the 32-bit ACE 2010 redistributable remains the correct, battle-tested answer. Have you run into the “bitness mismatch” error? Let me know in the comments — I’ve been fighting that dialog since 2012. Extended Properties='Excel 12.0 Xml

❌ → Run the installer from a local drive (not a network path). Also, ensure no Office apps are open (Outlook, Excel, Word).