Your old .mdb file should open seamlessly. If you get "Unrecognized database format," ensure you installed the correct bitness.
This is the official replacement for Jet OLEDB 4.0. It supports:
The Microsoft Jet Database Engine (Joint Engine Technology) is the underlying engine for older versions of Microsoft Access (specifically Access 97, 2000, and 2003). The OLEDB provider allows external programs to connect to .mdb files using a connection string like: Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb; download microsoft jet oledb 4.0
What (e.g., Windows 10, Windows 11) and system architecture (32-bit or 64-bit) are you using?
If the driver exists, use these connection strings. Your old
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=; Use code with caution. Modern ACE Connection String (32-bit and 64-bit)
If you are using C# or VB.NET:
Last updated: October 2025. This guide reflects the current state of Microsoft Windows 10, Windows 11, and Microsoft's official redistributable policies.
: If your application is running in 64-bit mode (x64), it cannot see or use the 32-bit Jet driver. It supports: The Microsoft Jet Database Engine (Joint
on modern versions of Windows (10 and 11), but it only exists as a 32-bit (x86)