Look at my screen please. I use CleanMyMac to clean up once in a while. its great when deleting apps and such, you just send it to the trash and it finds all the extra stuff, deletes it, and quits on its own. Same when it comes to external drives, it deletes unneeded files from those as well. Once in a while I go into it to clean log files and such, I do not understand what the Universal Binary part is. I run a MBP 5,3 model, with snow leopard. Do I need to keep those files? It says its something that has to do with powerbook.