I think the Poser 4 scene files are called "pz2" and Poser 5 are called "pzz". In general, manually texturising 3ds and obj files isn't what bugs me. It's when the material zones are called 1,2,3,4,....instead of "mirror", "wall", "door", etc. so you spend half a day trying to figure out what part of the model each material zone represents.