I agree with Sorin. This is not meant to be used for Mac to Mac compression necessarily (but it will do it if you know what you are doing). The key word here is CleanArchiver! It "cleans" your archives of all those nasty (but useful to Mac people) files that bother Windows people. I use this to make zip files that I can send to Windows people. OSX's built-in archiver works great but maintains the fork data, etc. in hidden files and Windows people can't seem to handle these extra files. Why they can't just ignore them is beyond me but they can't, so I use this wonderful tool to make it nice for them. And no Windows user is going to want to see a Stuffit file so we don't need that format supported.