Something I've installed on both computers (perhaps ACDSee Pro Image Viewer) has knocked compressedfolder association away. I never had this complication with Windows 7. Worse, the old assoc .zip=CompressedFolder in command prompt isn't working either, I definitely did it right. Can anyone think of a way to fix this. Yeah I could install 7-zip, but I'd rather understand the problem. It should be helpful if we figure out where CompressedFolder got off to in Win 8.

Click image for larger version