I have the paid version of Stuffit which works fine and opens most everything without a hitch. Also I've downloaded this same application from at least four sources always with the same result. Which leads me to believe that the company originating this application, which is an expensive one, has included some coding which makes it impossible to copy. I was particularly looking for one to use on my eMac - I already have a working copy on my PC. Guess I'll just use the PC version for now. Thanks.