Hmm. So, .pk3 is like a .vp (Volition Package), except with compression? .vps have the correct folder layout inside them, but any file with the same path that is
actually in the folders instead of in the .vp overrides the one in the .vp And, .vps don't have compression.
Is a .pk3 an actual .zip file, just with a renamed extension? So you can compress the stuff with
7-Zip to a .zip file, and choose the compression level?
* jr2 is curious.