Ryse Son of Rome - Inject Modified Files

I´m trying to inject some modified files with “Crysis 2 PAK Utility” to “ObjectsChar-part1.pak”.

Testing this method I got nothing injected:

http://s12.postimg.org/c7w0r5qh9/Sin_t_tulo.png

I don´t know if I´m doing something wrong. And I don´t know why the window show all “ObjectsChar-part1.pak” files when I´m trying to inject only 2 files.

Anyone know how to mod this game?

I want a helmet swap for Marius player model.