Hacking Help with Rayman Origins

[GOT4N]

Hello, I've been looking for Rayman Origins Wii unused / beta things, but that game uses IPK files, I extracted them but I get many files in many format, like some .anm.ckd, act.ckd, png.ckd some .gmt.ckd some tga.ckd and many others.
Here is the folder of 1 IPK file extracted: https://www.dropbox.com/sh/efa029x31r2kjik/kL-JlyPit0
Thanks