Search notes:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\instance name\Providers\ProgID

ProgID refers to a ProgID of an provider.
Two commonly found values under this registry key are These values are administered in SQL with 
exec master.dbo.sp_MSset_oledb_prop N'Microsoft.ACE.OLEDB.12.0' , N'AllowInProcess'   , 1;
exec master.dbo.sp_MSset_oledb_prop N'Microsoft.ACE.OLEDB.12.0' , N'DynamicParameters', 1;
In the example above, Microsoft.ACE.OLEDB.12.0 is such a ProgId of an OLE DB Provider.

See also

The parent registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\instance name\Providers

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