OLE DB defines a special class of providers, called document source providers, that manage access to folders and documents. A provider indicates that it is a document source provider by setting the value of the DBPROP_DATASOURCE_TYPE property to DBPROPVAL_DST_DOCSOURCE.
A consumer can expect a document source provider to exhibit the following behavior:
For more information about the column attributes associated with DBPROP_DATASOURCE_TYPE, see DBPROP_DATASOURCE_TYPE in Appendix C: OLE DB Properties.