Just to remind PC folk that Mac filenames cannot be longer >than 31 characters or MAT poses Yeah, this is the biggest issue. A point of clarification, this is only an issue on OS9. OSX does not have this limitation, but since Poser works through classic the OS9 issue still applies. It is easy to get confused though if a mac user downloads and instals the package in OSX then tries to use it. Also try to avoid spaces and special characters in your naming. Mac's are specific about these where Windows tends to be a bit more lax. As mentioned above, never use an EXE file. ZIP will do just fine. And I second the motion to put a link to MartinC's utility in the readme file. It sounds like you have plenty of Mac testers, but if you need yet another one I would be happy to help. I render all my Poser stuff in Vue.