Hi again, thanks to everyone for the replies, it's much clearer now. I really believe that Poser 4 manual should include a section about the different types of files used, what every one of them really does, and in what folder are they suposed to be kept. The first few times a rookie (like myself a few months ago) attempts to add some free item to his Poser, he really has not enough information about what must be done. Fortunately there are a lot of people out there willing to help new people; otherwise expanding the basic Poser could be a very frustrating thing for starters. Of course all veterans know where the .obj or the .cr2 or the .pz2 should be stored when downloading, but this is not exactly an intuitive process and Curious Labs should help a bit here with the Manual. It seems they rely that answers will be found in the Forums, or in the ReadMe which (thankfully!) are included in most downloads. Let the NCOs train the new recruits... Thanks again for your help.