"Kelderek (and any other who knows the answer)" Well, I will not pretend to know this answer, but I can write what I believe is the answer ;-) When loading a Poser pz3 file, Vue looks for a poser.exe file. It then validates that this is indeed a valid Poser 4 installation, using the serial number. Where you have the content files in Poser installed (in the Poser 4 or Poser 5 runtime directory) should not matter. Basicly (pure speculation here), you can have an empty Poser 4 runtime folder and Vue will happily import the pz3 as long as it is a correct Poser 4 installation. I have both Poser 4 and 5 installed on the same machine as Vue 4. When importing a pz3 file into Vue, I got a question which poser.exe Vue should look at when importing, since it found two of them. I pointed to the poser.exe that belongs to Poser 4, and everything worked fine. The pz3 in question was created in Poser 4, but I don't think that mattered at all, it was not even located in the Poser 4 directory.