Opening a Word or Excel document inside DTP doesn’t allow the user to zoom in or out its content. To do that one must open the native application. I think it would be very useful to add this feature in future releases of DTP.
thanks for the feedback! The display of Word/Excel documents is completely handled by (Snow) Leopard’s Quick Look plugins but we’ll check if there’s a way to add zooming as there’s no useful (Snow Leopard) or official (Leopard) interface for this.