Why Am I Getting the 'Cannot create an instance of OLE DB provider Microsoft.Jet.OLEDB.4.0' Error When Exporting Data to Excel?

"Cannot create an instance of OLE DB provider Microsoft.Jet.OLEDB.4.0 for linked server null"

The issue reported pertains to an error encountered while attempting to export data from a table into an Excel file using a T-SQL query. The specific error message indicates a failure in creating an instance of the "Microsoft.Jet.OLEDB.4.0" OLE DB provider for a linked server.

To address this issue, it is necessary to verify several settings and configurations:

1. Administrator privileges: Ensure that the user executing the query is an administrator with access to the TEMP folder (either "C:WindowsServiceProfilesLocalServiceAppDataLocalTemp" or "C:WindowsServiceProfilesNetworkServiceAppDataLocalTemp").

2. Ad Hoc Distributed Queries: Check if "Ad Hoc Distributed Queries" is enabled by executing the following command:

   EXEC master.dbo.sp_configure 'show advanced options', 1;
   GO
   RECONFIGURE;
   EXEC master.dbo.sp_configure 'Ad Hoc Distributed Queries', 1;
   GO
   RECONFIGURE;

3. OLE DB provider configuration: Execute the following commands to enable the required properties for the "Microsoft.Jet.OLEDB.4.0" OLE DB provider:

   EXEC master.dbo.sp_MSset_oledb_prop N'Microsoft.Jet.OLEDB.4.0', N'AllowInProcess', 1
   GO
   EXEC master.dbo.sp_MSset_oledb_prop N'Microsoft.Jet.OLEDB.4.0', N'DynamicParameters', 1
   GO

4. OLE DB provider registration: Register the "msexcl40.dll" file by running the following command:

   regsvr32 C:\Windows\SysWOW64\msexcl40.dll

Note that for SQL Server 2014 and higher, the "DynamicParameters" property should be used instead of "DynamicParam" in the "sp_MSset_oledb_prop" command.

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