Hi everyone. I'm a Mac novice and looking for some advice about BOM Archiver. At the school where I am teaching at the moment the word and power point files on my USB drive keeping appearing as Zip files on the Mac at the school. The problem is that they aren't saved as Zip files but rather just regular uncompressed files so I don't know why this keeps happening. When I click to open them with BOM Archiver they start to "multiply" into more zip files. I've tried opening them in Microsoft office but no luck. Also, the other Macs at the school don't have this issue -just this one desktop. I need this computer to show power points etc to pupils but can't open the files. Any suggestions?