"Poser installs the native library compressed by default. That's why if you look at the files in there, they are crz instead of cr2. I have to un-compress the runtime so that I can use a cr2 editor. The crz files don't work in my editor."

Confirmed. This is something I didn't know.  There was 5.12G of CRZ files located on my C: drive.  These files were left over from Poser 9 installation.  Though I remember them being installed, I never knew they were compressed files.  Since I'm in a never ending battle to restore space on my primary drive, this is essential information.  Honestly, I simply thought they were a type of file native to Poser and only used by Poser!  Thanx Rocket. 

Those were only the Crz files.  Also there was OBZ, Hrz etc that relates directly to Obj and Hr2 files etc.  Full disclosure says any typical decompressing software will decompress these files.  According to littlefox there is a python script that ships with Poser that will do the deed as well.