This is the package which is the base for most mods. Most Spore processes are in this package, the gameplay is stored in this package. Some examples of thing not in here are Creature Parts, Graphics, and Audio. Mods can be made from changing and deleting files and floats and other things in this package. This package is needed in almost all mods. It does not have a long unpack time, usually less than ten minutes on an Windows XP or Mac OS X.