MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Initialization
Property set: DBPROPSET_DBINIT
Type: VT_BSTR
Typical R/W: R/W
Description: Extended Properties
A string containing provider-specific, extended connection information. Use of this property implies that the consumer knows how this string will be interpreted and used by the provider. Consumers should use this property only for provider-specific connection information that cannot be explicitly described through the property mechanism.
Note If the provider supports setting OLE DB properties via the provider string, and if an OLE DB property is set both via its own property ID and within the Extended Properties provider string, whichever setting takes effect is provider-specific.