Do you have WinZip? You can do it there but it's very very complicated..I think I still have my notes... First association pzz to winzip. (Renaming to .zip doesn't work) Then copy the pzz to another directory. double-click pzz and it opens in a winzip window. I'm on XP and can't drag it out of the zip because winzip can't find it (it's in documents and settings). So.... must double-click on the pzz inside Winzip and the addto zip or whatever dialog opens. click 'new zip' and navigate to where you want it, give it name, and click 'add to zip' Now find the .zip you created, right-click and 'extract to here' and overwrite the pzz. Lastly rename the extension to pz3.