Ok, here's the skinny on the "00" thing. Poser 4 will read the files with or without the "00". Pro pack and P5 will not, the "00" is essential for use in PP and P5. And since it makes no difference at all to P4, including the "00" will allow the file to be read by all three versions of Poser. Kuroyume: Yes, it's very easy and simple to install Poser 4 without affecting other installations. Simply install it to a folder with a different name. Example: My Pro Pack is installed to D:Poser 4 and when I need to test something in Poser without propack I install to D:Poser 4 Testing It doesn't really matter what drive you install it on or what folder name you use. It will install just fine. I install everything to my D or E drive since my C drive is only a little over 5 gigs and all I keep there is my OS and peripheral drivers (printer, scanner, etc). I use my D: drive for graphics software and my E: drive for things like word processor, html programs, sound programs, games, utilities, etc. Kate