don't add the extension: C:\copy foo.zip\*.* myfoo should be C:\copy foo\*.* myfoo Yeah, I had tried that, too. No luck. I can type foo.zip by itself - it opens in the explorer window of course. Are you sure you don't have some virtual folder extension installed? Or perhaps a cmd.exe replacement that has native zip support? I thought that there might be a command line switch for cmd that would enable zip support, but I haven't found any. Thanks for the fast reply.