You can install the Microsoft Access Database Engine Redistributable which provides the Microsoft.ACE.OLEDB.12.0 provider for both 32-bit and 64-bit.

The Microsoft.ACE.OLEDB.12.0 provider is a 64-bit OLE DB provider that allows .NET applications to connect to Microsoft Office file formats, such as Access databases (.mdb, .accdb), Excel spreadsheets (.xls, .xlsx), and Text files. In this review, we'll cover the features, installation, and usage of this provider.

Conclusion: Your Action Plan

To successfully download Microsoft.ACE.OLEDB.12.0 provider for both 64-bit and 32-bit, follow this checklist:

The "Microsoft.ACE.OLEDB.12.0" provider is part of the Microsoft Access Database Engine Redistributable. While older 2010 versions are harder to find on official landing pages, the 2016 Redistributable is the current standard and provides the updated OLEDB 16.0 driver, which often maintains compatibility with 12.0 connection strings.

Note: Both files are listed on the same Microsoft download page. Look for the "Choose your download" section and select the appropriate version.

Important Notes for Installation

  1. Cannot coexist with Office (bitness mismatch): If you have 32-bit Microsoft Office installed, the 64-bit ACE provider will not install (and vice versa). You would need to use the matching bitness or install the ACE provider in "silent" mode with the /passive switch.
  2. Provider name after installation: Once installed, your connection string should use: 
    Provider=Microsoft.ACE.OLEDB.12.0;
  3. Alternative (Newer Provider): For better compatibility with modern systems, consider using the Microsoft Access Database Engine 2016 Redistributable (provider name Microsoft.ACE.OLEDB.16.0). You can download it here: Microsoft Access Database Engine 2016 Redistributable (select AccessDatabaseEngine_x64.exe).

The Microsoft.ACE.OLEDB.12.0 provider is part of the Microsoft Access Database Engine. To use it in both 32-bit and 64-bit environments on the same machine, you typically need to install the Microsoft Access Database Engine 2010 Redistributable or the newer 2016 Redistributable using a command-line workaround, as Microsoft generally prevents installing both bitness versions through the standard interface. Official Download Links

Silent Installation (For IT Admins):

To deploy across many machines silently:

Download both the 32-bit (AccessDatabaseEngine.exe) and 64-bit (AccessDatabaseEngine_x64.exe) installers from the Microsoft Download Center.

Download New! Microsoft.ace.oledb.12.0 Provider For Both 64-bit May 2026

You can install the Microsoft Access Database Engine Redistributable which provides the Microsoft.ACE.OLEDB.12.0 provider for both 32-bit and 64-bit.

The Microsoft.ACE.OLEDB.12.0 provider is a 64-bit OLE DB provider that allows .NET applications to connect to Microsoft Office file formats, such as Access databases (.mdb, .accdb), Excel spreadsheets (.xls, .xlsx), and Text files. In this review, we'll cover the features, installation, and usage of this provider.

Conclusion: Your Action Plan

To successfully download Microsoft.ACE.OLEDB.12.0 provider for both 64-bit and 32-bit, follow this checklist: download microsoft.ace.oledb.12.0 provider for both 64-bit

The "Microsoft.ACE.OLEDB.12.0" provider is part of the Microsoft Access Database Engine Redistributable. While older 2010 versions are harder to find on official landing pages, the 2016 Redistributable is the current standard and provides the updated OLEDB 16.0 driver, which often maintains compatibility with 12.0 connection strings.

Note: Both files are listed on the same Microsoft download page. Look for the "Choose your download" section and select the appropriate version. You can install the Microsoft Access Database Engine

Important Notes for Installation

  1. Cannot coexist with Office (bitness mismatch): If you have 32-bit Microsoft Office installed, the 64-bit ACE provider will not install (and vice versa). You would need to use the matching bitness or install the ACE provider in "silent" mode with the /passive switch.
  2. Provider name after installation: Once installed, your connection string should use: 
    Provider=Microsoft.ACE.OLEDB.12.0;
  3. Alternative (Newer Provider): For better compatibility with modern systems, consider using the Microsoft Access Database Engine 2016 Redistributable (provider name Microsoft.ACE.OLEDB.16.0). You can download it here: Microsoft Access Database Engine 2016 Redistributable (select AccessDatabaseEngine_x64.exe).

The Microsoft.ACE.OLEDB.12.0 provider is part of the Microsoft Access Database Engine. To use it in both 32-bit and 64-bit environments on the same machine, you typically need to install the Microsoft Access Database Engine 2010 Redistributable or the newer 2016 Redistributable using a command-line workaround, as Microsoft generally prevents installing both bitness versions through the standard interface. Official Download Links

Silent Installation (For IT Admins):

To deploy across many machines silently: Cannot coexist with Office (bitness mismatch): If you

Download both the 32-bit (AccessDatabaseEngine.exe) and 64-bit (AccessDatabaseEngine_x64.exe) installers from the Microsoft Download Center.