"The only reason one could not buy these products and use them is because... Well, there are no good reasons. So, what's the big deal? " So, if you went to say McDonalds, and you bought a hamburger, and when you got home to eat it, you discover that the bun isn't cut, the meat isn't cooked, and the sandwhich isn't put together, you would be okay with that? I mean, assuming that you have a knife, and a working stove, you have the tools at your disposal to make the hamburger... The big deal is that you're paying money for a product. If the product says that it's P4 compatible, then it should have it's version set to at least 4.01, and it should include .rsr files. If a product says it's ProPack only, then that's fine, at least no one is being decieved, but frankly, there's no good reason for a merchant to NOT make their products P4 compatible. As a side note, there's really no reason to include .png files anyway if there are .rsr files... which will cut down on your end product file size (not very much, but sometimes every bit counts), since ProPack and Poser5 will create new .png files from the .rsr files.