Thanks for all the feedback. Unfortunately, a good portion of what has been suggested simply won't work. Peggy W got it right. It has to be the valid Poser 4 executable and you have to have a valid Poser 4 serial number. The problem has nothing to do with the file format. It is some kind of a serial number protection scheme. I contacted e-on about it, and a rep said CL had something in the works. When I contacted CL about it, a rep said it was somewhat doubtful that Vue would ever be fully compatible with Poser 5 due to the new hair growth and dynamic cloth stuff, i.e., that it would require e-on to add an enormous amount of code to their software and this rep at least thought that was unlikely to happen. Of course, when customers aks for it, loud enough and long enough, a lot of things have been known to happen ... I have encouraged eon to go for it (i.e., full Poser 5 compatibility), and I hope others will too.