Curious Labs was going to have something like this available, it was promised a long, long time ago. Never surfaced, I'm pretty sure, for free or for sale. There are NO specs on any of the Poser formats, as far as I know. There is only "what works" and "what doesn't work", and your results will vary between Poser 2,3,4, PP and 5. I've heard the 5 doen't support the switching geometry files that were how Poser 2 did hands, that all versions supported untill now, for an example. Oh, and there is also "what seems to work" and "what should work but doesn't" ;-) What a can of worms!