Download Microsoft Jet Oledb 4.0 ((exclusive)) 🆕 🎉

Microsoft Jet OLEDB 4.0 is a legacy database engine that is no longer available as a standalone download

from Microsoft. It has been functionally deprecated since Windows 2000. Microsoft Community Hub The original Jet 4.0 provider is pre-installed

on modern versions of Windows (10 and 11), but it only exists as a 32-bit (x86)

component. If you are encountering a "Provider is not registered" error, it is typically due to an architecture mismatch—your 64-bit application is trying to use a 32-bit driver. Microsoft Learn 1. Identify the Correct Replacement

Because Jet 4.0 does not have a 64-bit version, you should use the Microsoft ACE OLEDB Provider

, which is its modern replacement and supports both 32-bit and 64-bit systems. Stack Overflow For 64-bit applications: Microsoft.ACE.OLEDB.12.0 (or higher). For 32-bit applications: You can keep using Microsoft.Jet.OLEDB.4.0 , which is already in your system at C:\Windows\SysWOW64\msjetoledb40.dll Stack Overflow 2. Download and Install ACE OLEDB

To get the 64-bit driver (or a fresh 32-bit one), download the Microsoft Access Database Engine Redistributable Microsoft Access Database Engine 2016 Redistributable

The story of downloading Microsoft Jet OLEDB 4.0 is essentially a tale of how a once-universal piece of Windows "glue" became a legacy relic that modern developers often have to "trick" or replace to keep old software running. Microsoft Community Hub The Rise and Integration of "Jet" In the 1990s and early 2000s, the Jet Database Engine (specifically version 4.0) was the powerhouse behind Microsoft Access download microsoft jet oledb 4.0

. It was so fundamental that Microsoft eventually baked it directly into the Windows operating system (Windows 2000, XP, and Vista). Microsoft Community Hub

Because it was already in Windows, developers didn't need to "download" it—it was just

, like Notepad or Calculator. If you were using a 32-bit application and needed to connect to an Provider=Microsoft.Jet.OLEDB.4.0 was your go-to connection string. Microsoft Learn The 64-Bit Crisis

The "story" gets complicated when 64-bit Windows arrived. Microsoft decided that Jet 4.0 would remain 32-bit forever Microsoft Learn The Problem:

If you tried to run a 64-bit application that used the Jet 4.0 driver, you would get the infamous error:

"The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine" The Reason:

A 64-bit process cannot talk to a 32-bit driver like Jet 4.0. Stack Overflow Why You Can't Simply "Download" It Today Microsoft Jet OLEDB 4

If you are looking for a standalone download for "Microsoft Jet OLEDB 4.0" today, you won't find one for modern 64-bit systems. Instead, the "helpful story" for users today involves two specific workarounds: Microsoft Community Hub

Important Note Before You Start:
Microsoft Jet OLEDB 4.0 is obsolete. It was originally included with Windows 2000 through Windows XP / Server 2003. Microsoft stopped supporting Jet OLEDB in 2013, and it is not natively available on modern Windows (Vista, 7, 8, 10, 11) or Server editions beyond 2008 R2.

You cannot download Jet OLEDB 4.0 as a standalone installer from Microsoft anymore. However, this guide explains what it is, where it still exists, and the official modern replacements.

2) Check your Windows and app bitness

  • Jet 4.0 is 32-bit only. It works only with 32-bit applications on 32-bit or 64-bit Windows (running the app as 32-bit).
  • If your application is 64-bit, install and use the Access Database Engine (ACE) 64-bit provider.

1. It is Part of the Operating System (or was)

Beginning with Windows 2000 and up through Windows 7, the Jet OLEDB 4.0 driver was included as part of the Windows Data Access Components (MDAC/WDAC). You never "downloaded" Jet 4.0 separately; you installed Windows.

Option B: Compile your .NET App as x86

If you are using C# or VB.NET:

  1. Go to Project Properties > Build.
  2. Set Platform target to x86 (not Any CPU or x64).
  3. Recompile.

The 32-bit version of your app can see the Jet driver. Again, no download required – it is already on the system (for Windows 7, 8, 10, 11 up to certain builds). Note: Recent versions of Windows 10/11 Home may have the driver removed entirely due to security. Check the next section.

The Hard Truth: You Cannot "Download" Jet 4.0 Separately

Microsoft has never distributed the Jet OLEDB 4.0 provider as a standalone downloadable installer (like an .exe or .msi file named "Jet40Setup.exe"). This is the most common misconception. 2) Check your Windows and app bitness

How Jet 4.0 actually gets installed on your computer:

  • Windows 2000, XP, Vista, 7, 8, 8.1: The Jet 4.0 engine was included as a core component of the operating system. It was pre-installed.
  • Windows 10 and Windows 11: Microsoft removed the Jet OLEDB 4.0 provider from the default OS installation, starting with Windows 10 (around 2015-2016) to reduce legacy attack surfaces and push developers toward modern solutions.

Therefore, if you are on Windows 10 or 11 and you type regedit to search for Microsoft.Jet.OLEDB.4.0, you will likely find it missing.

Solution 3: The "Bitness" Mismatch Issue

This is the most common error developers face.

If you have Microsoft Office 64-bit installed, your system already has the 64-bit ACE drivers. However, if you are running a 32-bit application (like an old VB6 app or a 32-bit IIS Application Pool) and try to use the ACE driver, it will fail because it tries to load the 64-bit driver into a 32-bit process.

To fix this, you need the 32-bit Access Database Engine, but Microsoft prevents you from installing the 32-bit engine if you have 64-bit Office installed.

Option B – Use "Windows XP Mode" (Windows 7 only)

  • Only available on Windows 7 Professional/Ultimate
  • Not for Windows 10/11.

The Situation: Why you can't "just download" it

Microsoft Jet OLE DB 4.0 is deprecated and is not available as a standalone download for current versions of Windows.

  • Windows XP / Server 2003: It was included by default.
  • Windows Vista, 7, 8, 10, 11: It is not installed by default.
  • 64-bit Systems: The Jet 4.0 engine is 32-bit only. There is no 64-bit version. If you are running a 64-bit application, Jet 4.0 will not work.