Also there are some very helpful people in the Macintosh Forum here who use Poser. They have helped me out a few times. Try that too. Vendors who state "PC only" have to say that if they just don't know and had no Mac testers. The 2 I approached in the past couldn't help and just reminded me that their product was not sold as 'mac compatible'. They weren't unpleasant.... they just knew nothing about Macs and as grichter said the problem can be a simple naming issue - too long or having a '_' or a '/' in there ( which is what I found on two occasions ) that a mac takes issue with. Easily fixed but sometimes hard to find the why of a problem . I render my own png.s for any that might be missing. ( 91x91 ) I also buy what I like regardless and as you have found most content works just fine. As do many python scripts. But if a utility program like Universal Texture Converter says PC only then I take their word for it ! LOL and I am one of the ones still living in a cave.... I keep Classic on my otherwise OSX system only so I can still use Mac Converter........ Old habits die hard !

" Try and be nice to people, avoid eating fat, read a good book every now and then, get some walking in, and try and live together in peace and harmony with people of all creeds and nations."
-Monty Python