Haven't installed P6 SR2 yet, but had same problem way back (a P5 beta after a PP re-install IIRC). (Realised issue reading this thread yesterday, but assumed it was obvious to all - sorry!) Poser doesn't use registry entries per se (it's a Mac app), which is probably why CL overlooked them. BUT, any application with a unique file type in Windows (eg. .pz3) has an entry (or entries) in the registry for the file type. You used to be able to fix this out-of-order install problem, by simply going to Windows Explorer > Tools > Folder Options > File Types > and look up the various Poser file extensions - starting with .pz3 of course - and changing them until you hit the one that the installer was using. Anyway, might be worth a try - esp. by CL who'll know which one it's look for - before a full re-install - ugh! CL probably made the issue more prevalent with P6 because instead of naming a .pz3 file a "Poser file" as was always done before, they renamed it to be a "Poser6 file."