New! Download Microsoft Jet Oledb 4.0 Jun 2026

Fixing the "Microsoft.Jet.OLEDB.4.0 provider is not registered" Error

To use ACE, you should download the (which provides the 12.0 provider) or its newer equivalents. This is the genuine Microsoft download that resolves the "provider not registered" error for legacy applications. This package, available in both 32-bit and 64-bit versions, finally provides the native 64-bit database engine that developers have been searching for. download microsoft jet oledb 4.0

The driver is already installed. You don't need to download anything. Fixing the "Microsoft

When reading older Excel files, you must specify the Extended Properties to instruct the driver to treat the file as a spreadsheet. The driver is already installed

If the provider is already in Windows, why do you see the error "Microsoft.Jet.OLEDB.4.0 provider is not registered on the local machine" ? The answer almost always boils down to a simple but critical compatibility issue: .

If you are struggling with compatibility or need to work with newer file formats, you should download the from the official Microsoft Download Center.

If you are running a Classic ASP website on IIS 7+ that uses Jet 4.0: