You get a message that says something like "Poser has detected a newer than expected version number, but will attempt to open the file anyway". Click "ok" and it opens just fine. But if you don't know about the message, you might not think it will work. If the message isn't there, no worries. Now, some stuff is P5 only... materials with displacement maps or stuff for the P5 family... so you probably don't need to edit the version number. Carolly