praxis, "when I click on a file and it opens in P5 instead" I believe you can fix things so that P4 rather than P5 opens a double-clicked .pz3 files as follows: Open Windows Explorer > Tools > Folder Options... > File Types > search for and highlight PZ3 > Advanced > Edit... > set Application used to perform action: to "C:Program FilesCurious LabsPoser4Poser.exe" "%1" (include the quotes too). You can repeat on other filetypes, or leave as is so that e.g. .pzz opens still in P5. Leastways that's what mine was reset to when I installed ProPack after installing Poser 5. ps. Pleas let me know if this works, and what the value was that you over-wrote so we can document how to convert back to Poser 5 as default opening application.