Extra Quality Download Microsoft Jet Oledb 4.0 Jun 2026

ACE supports both .mdb (Jet 4.0) and .accdb files, and works with OLEDB (though connection strings differ).

32-bit (x86) only. It has no native 64-bit version.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\data\db.mdb; Summary of Connection Strings download microsoft jet oledb 4.0

What or software are you using to connect to the database? Are you running on a 32-bit or 64-bit operating system?

The Jet (Joint Engine Technology) OLEDB 4.0 driver is a 32-bit database engine. Microsoft designed it to connect applications developed in languages like VB6, VBA, ASP Classic, and early versions of .NET to desktop databases. Key Characteristics ACE supports both

Microsoft Jet (Joint Engine Technology) 4.0 was designed as a general-purpose database engine for 32-bit environments.

If you are running a 32-bit application on a 64-bit Windows 10/11 system, you don't need a new download; you need to register the existing provider or configure the application to run as 32-bit. Solution 1: Run as 32-bit (x86) Provider=Microsoft

because Jet 4.0 was part of the Windows OS, not a redistributable package. It came pre-installed with Windows up to XP/Server 2003. On newer Windows, Jet 4.0 DLLs are missing or severely restricted.

You cannot download Microsoft Jet OLEDB 4.0 as a standalone, isolated installer anymore because it is . It comes pre-installed by default on all modern versions of Windows, including Windows 10 and Windows 11.

Follow these steps to resolve the Microsoft.Jet.OLEDB.4.0 error in your application: