When you drag-drop a dwf/x into a Powerpoint file. Actually, you embeded an ADR ActiveX control in that Powerpoint file. And what you see in the Powerpoint file is a preview of that dwf/x file. If you double click on the preview, the ActiveX contril will be actived and you can view all dwf/x pages in that control.
Hope that helps for you.
Herbert He SW Engineer PSEB-GE- ACRD PSEB Autodesk, Inc.