Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\folder\path\;Extended Properties="text;HDR=Yes;FMT=Delimited";
The "Microsoft.Jet.OLEDB.4.0" provider is an older technology used to allow applications to access and manipulate data within various file formats, most notably Microsoft Access databases (.MDB files) and older Excel files (.XLS). It was a key component of the , which was introduced in 1992 and was the underlying database engine for many Microsoft products, such as Access and Visual Basic. Jet 4.0, the final version of this engine, was released in 2000 and brought many critical features, including Unicode character storage support and a more efficient record-locking model.
If you are building a new application or modernizing an old one, you should migrate away from Microsoft Jet OLEDB 4.0. Microsoft has replaced it with newer, more robust drivers that support both 32-bit and 64-bit environments. 1. Microsoft Office Access Connectivity Engine (ACE)
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). download microsoft jet oledb 4.0
Microsoft Jet (Joint Engine Technology) 4.0 was designed as a general-purpose database engine for 32-bit environments.
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\data\db.mdb;
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=; Use code with caution. Connecting to Microsoft Excel (.xls) Provider=Microsoft
To ensure your system has the latest updates, run to automatically patch the built-in Jet files against security vulnerabilities.
Change application target to or enable 32-bit apps in IIS. Need true 64-bit database operations
: It primarily supports Access 2000–2003 formats ( .mdb ) and Excel 97–2003 formats ( .xls ). Why You Can't Find a "Download" Link If you are building a new application or
It comes in both , solving the architecture limitation of Jet 4.0. 2. SQL Server Express LocalDB
Here is the hard truth:
or for newer ACE 16.0:
Jet 4.0 is aging technology. Consider migrating your data storage to modern platforms like SQLite, Microsoft SQL Server Express, or Azure SQL for better performance, security, and native 64-bit support.
: Starting with Windows 2000, the Jet 4.0 engine became a core component of the Windows operating system.