This tutorial has all the information for example how to decompressed after hex editing, how to fix the security etc.
here is the link to the PDF file.

http://www.mediafire.com/?w5plw5yrm6x680o

Credit goes to kals9

Good news is this teaches you how to Mod the game bad news is I don't have the resigner that mojo and unknownv2 came out with.

Ill try to look around for it if I can:(