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Can I use the ESRI OLE DB provider to connect to a Microsoft Access.mdb file that is not a geodatabase?
No you cannot. If you do use the ESRI OLE DB provider to connect to a non-geodatabase Access.mdb, the ADO/OLE DB connection will return the following error:
Error number : -2147220973
Error description: "Underlying DBMS error".
Use one of the Microsoft Jet OLE DB providers to make the connection.