Like mrsparky mentioned, I have a Geometry Stripper software program available for free at Vanishing Point. It's for Windows 98 and above, though it hasn't been tested on Windows 8. ;)

Anyway, props should have obj files to conserve memory: when you load the same prop into the scene multiple times, Poser only has to reference one set of geometry coordinates.

Plus, mapping programs like UV Mapper can only read obj files, not pp2 or cr2 files. This makes it easier for people to create their own templates or change the mapping.

Props can reference multiple obj files, which comes in handy if you're making a room model with tables and chairs.

VanishingPoint... Advanced 3D Modeling Solutions