I'm having a bit of the same problem. I've downloaded a .bin file which should open with Stuffit Expander. However, when I drop the file onto the icon, I get a message saying that "the file does not seem to be compressed", and asks me if I want to open it with LimeWire. Obviously, that doesn't work. Rebuilt desktop, can't do anything in the File Exchange CP (it recommends I open it with GraphicConverter!); don't have MacArmyKnife. Any suggestions? Am I using the File Exchange CP incorrectly? TIA.