Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\path\to\file.xls;Extended Properties="Excel 8.0;HDR=YES;IMEX=1";
Update your source code's connection string to target the newer provider:
Download and update connection strings.
You are upgrading to the newer Microsoft Access Database Engine to read .accdb or .xlsx files. How to Get Microsoft Jet OLEDB 4.0 Components
If you visit the official Microsoft Download Center today, you will find that the standalone Microsoft Jet 4.0 service packs are . download microsoft jet oledb 4.0
Microsoft Jet OLEDB 4.0 provider is a legacy 32-bit database engine primarily used to connect to Microsoft Access (
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. Provider=Microsoft
Users often see this error on 64-bit machines because there is no 64-bit version
While it works on modern 64-bit Windows, it requires proper configuration for 32-bit interoperability. How to Fix the "Not Registered" Error (32-bit Apps) Microsoft Jet OLEDB 4
Fix 2: Enable 32-Bit Applications in IIS (For Web Developers)
Install the ACE engine and update your connection string. Your legacy app will likely run just fine.
