Well, Ill try to explain it, but my english isnt very good. Pz3 files are poser documents. When you save a work in Poser, it is saved as a .pz3 file. All you have to do to open this file is double click on it. Cr2 files are "character" files. They go inside Poser/Runtime/Libraries/Characters/any folder you want. Just place it there and next time you open the Character menu in Poser, at the right of the screen, youll find it there. Other suffixes youll find are (all, inside Poser/Runtime/Libraries/...): Camera: .cm2 Faces: .fc2 Hair: .hr2 Hand: .hd2 Light: .lt2 Pose: .pz2 Props: .pp2 Obj. files go into Poser/Runtime/Geometries. You should read all the read me files that come with the downloads to know exactly where to place the files. Well, hope this helps at least a bit. Sorry about my english, Im spanish... ;-)