Well, so much for clear, concise instructions. The File Type tab lists files by their program types, not by extension. Before you do the above, right-click on the zip file, then on 'Properties.' The properties box should tell you what listing zip files fall under in the File Type list. Even if it says it's associated with your extraction program, I'd remove the file type anyway, because it sounds like there's a cross-link operating. By deleting the type and reassociating it, you should break the link and be back in business.