Download ~upd~ Microsoft Jet Oledb 4.0 «PREMIUM × 2026»

Jet 4.0 is 32-bit only. If your app is 64-bit and tries to use Jet 4.0 → error. Solution: Recompile your app to 32-bit, or switch to ACE OLEDB (which supports both).

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) download microsoft jet oledb 4.0

A very common pitfall occurs when trying to install the ACE provider on a system that already has Microsoft Office installed. There is a strict rule: For example, if you have 64-bit Office installed, you can only install the 64-bit ACE provider. Attempting to install the 32-bit ACE provider on a system with 64-bit Office will result in an installation error. Provider=Microsoft

Microsoft Jet OLEDB 4.0 provider is a legacy 32-bit database engine primarily used to connect to Microsoft Access ( Attempting to install the 32-bit ACE provider on

Change your connection string from Provider=Microsoft.Jet.OLEDB.4.0 to: Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\yourdb.accdb; .