This file was copied out of the full install of the Creature Creator for Spore and as such, it is only the CSA_Main.package file compressed into a rar.
To be able to unlock the new parts, just extract CSA_Main.rar to (C:\\ Program Files\\ Electronic Arts\\ SPORE\\ Data)
Also, despite what many people are saying this does not unlock 75% of the total parts, not by a long shot. It really only unlocks around 50% or so, but still it\'s better than nothing.