я так понял AddOLEObject возвращает некий InlineShape
Represents an object in the text layer of a document. An inline shape can only be a picture, an OLE object, or an ActiveX control. InlineShape objects are treated like characters and are positioned as characters within a line of text. The InlineShape object is a member of the InlineShapes collection. The InlineShapes collection contains all the shapes in a document, range, or selection.