PCs are going to have a lot more problems with Mac Poser files than going the other way. If the files are Stuffed they still have the Macbinary headers on them, I would guess the PCs will choke on that until they are stripped and the right extensions added. And Mac CR2s don't have RSRs as company, they are all in the same file. In the real world, however, Mac users expect to be able to convert PC files, PC users don't have the slightest clue on converting Mac stuff. So except for programs, the only valid choice would probable be: "PC/Mac" or "Mac Only" BTW, I consider myself Bilingual, as I one of the very few who use both all the time!