Here is the steps for using
QUICKBMS to unpack all.cpk (The program is at the top of the page.
QuickBMS generic files extractor and reimporter 0.7.1)
1. When you launch QuickBMS, it will ask you for the script file. It is usually smart to name it cpk.bms
2. Next it will ask you for the CPK file. Locate it and select it.
3. It will ask you for the directory you want to save it in. I suggest you make a new one named after the file you are working with because you are liable to end up with 10,000 files.
4. Sit back and let it do it's magic.
5. Sort through the giant mess.
It does work. Just did it and there seems to be 9218 files in the package. I have included the cpk.bms I used to do it. I take no credit for the creation of any of the included files. Just passing them along.