MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Data Source Information
Property set: DBPROPSET_DATASOURCEINFO
Type: VT_BSTR
Typical R/W: R
Description: Provider Name
Indicates the file name of the provider—for example, "Myprvdr.dll". Prior to MDAC 2.5, this property was named DBPROP_PROVIDERNAME.