I have read he forums, and learned a few things, but!!!....Stuffit will not open it, Unarchiver will not open it, Better Zip will not open it, What I think is the the Mac "Archive Utility" will not open it. Is this file possibly "encrypted" or Protected in some way? When I double click or just click per the zip Application, my machine blinks and the icon in the dock jumps but the file don't open. File is from "work" and they use Winzip for everyting,but I have to be missing something here.