Can anyone recommend a simple unzipper for Snow Leopard? I repeatedly get an error message sauying Stuffit Exapnder will not work without the original Stuffit Engine. Just checked Stuffit and the new version goes for $79. Saw mention of UnRarX, tried to download it and got the message: Stuffit expander will not work without the original Stuffit Engine. Does Stuffit have a monoply on this market?