I think there is a listing and explanation of all poser file types in the tutorials section... try a search there. Poser 'is' picky about where you put most of them. but in general: PZ2 is a pose file... in the pose library, rsr is a companion file mostly needed to generate library icons and should be placed in the same library folder as its same named pz2, pp2, hr2, or whatever. cr2 is a character file - figures library, pz3 is a scene or animation file (your working file) and can be put anywhere you like. hr2 is hair, pp2 is prop, fc2 is a face file, obj is your geometry file (the geometry matching rsr is not just an icon, but if you delete it and load the geometry file, poser will create a new one)... etc. Check out the tutorials, and search this forum for any file type threads. ...and oh, welcome to the addiction ;)