Any .hr2 (hair files) and .rsr(with same names)go in Runtime/Libraries/hair - folder. Any folder of your choice.

Any .obj files goes in the Geometry folder (Runtime/Geometries). You can create a new folder with name of your choice and place them there.

Any .cr2 and .rsr (with same names) will go int the Runtime/Libraries/Character. And again, you can have your own folders.

Any .pp2 and .rsr (with same names) go in Runtime/Libraries/Props.

Any texture files (.jpg .bmp .tif, etc) go in Runtime/Textures. Or you can have them where you like.

Any .pz2 and .rsr (with sam name) go in Runtime/Libraries/Pose. Some hair colors and styles are in this format.

Hopefully the pro's correct me if I've got it all wrong. ;o)

Hope this helps.