ObjectFrame.SourceObject Property (Access)
You can use this property for linked unbound object frames to determine the complete path and file name of the file that contains the data linked to the object frame. Read-only String.
expression A variable that represents an ObjectFrame object.
For unbound object frames, the SourceObject property is set automatically when you use the SourceObject command on the Insert menu to insert a linked OLE object.
For linked unbound object frames, the SourceObject property can't be set in any view.