What (e.g., Windows 10, Windows 11) and system architecture (32-bit or 64-bit) are you using?
ACE supports both .mdb (Jet 4.0) and .accdb files, and works with OLEDB (though connection strings differ).
If you are trying to connect an older application (like a VB6 project or a classic ASP website) to a Microsoft Access database, you have likely encountered an error stating that the provider is not registered.
To fix this, you need the Access Database Engine, but Microsoft prevents you from installing the 32-bit engine if you have 64-bit Office installed. download microsoft jet oledb 4.0
The provider is a core database engine component that allows applications to connect to external data sources. It is primarily used to connect to Microsoft Access databases (.mdb) and Microsoft Excel spreadsheets (.xls).
| | Supports | Download | Architecture | |--------------|--------------|----------------|--------------------| | Microsoft Access Database Engine 2016 Redistributable | .ACCDB, .MDB, Excel .XLS/.XLSX, CSV, etc. | Microsoft Download Center | 32-bit & 64-bit (choose carefully) | | Microsoft ACE OLEDB 12.0 or 16.0 | Same as above | Same as above | 32/64-bit | | .NET Data Providers (OleDb in .NET) | Uses ACE if installed | Part of .NET Framework | Any CPU |
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\folder\;Extended Properties="text;HDR=Yes;FMT=Delimited"; Best Practices for Legacy Drivers What (e
If you have 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.
Download the Microsoft Access Database Engine 2010 Redistributable (provides 32-bit and 64-bit options).
Installing Microsoft Office 2003, 2007, or a 32-bit version of Office 2010 will also register the Jet 4.0 provider on your system. However, this is overkill for most development needs. To fix this, you need the Access Database
The Microsoft Jet (Joint Engine Technology) OLEDB 4.0 provider is a database engine that allows applications to communicate with data sources without needing to know the underlying structure of the file.
If you are writing a technical paper or documentation, the correct terminology is:
A quick web search might bring you to blog posts offering a file named AccessDatabaseEngine_X64.zip that claims to solve the Jet 4.0 problem. Be extremely careful with these sources.