If your just talking about converting a Poser MAC PZ3, CR2, or other Poser file, the MAC Converter program is SAFE and easy to use. There is no reason to go into ResEdit or any other techie program at all. If you don't have a MAC and need a conversion, then I'd just ask someone here to convert it for you. Assuming it's a public domain (FREE non-comercial or not copywrited) file. If you want to open a MAC file on a PC , there is a program that allows you to see the file on a PC, but you can't do anything with it. This is mostly for just plain text files. Hope this helps. James