Well for those who got CoD 2, and want to modify it on a Mac, its realy simpel and possible !
Needs: Your Apple Computer

First locate the data files, they are in your /Call of Duty 2 Data/main/ folder, yes the .iwd files !
How to unpack ?
If you got Stuffit, just drop it on the Expander, it now shoud expand it self, it also works with the build in ZIP-archiver.
Now you got all folders/files that are in the .iwd file, yay


Now you can start editing files, like adding ammo etc, i havent personaly found out yet how to open and edit the .dds and .tga files, i kno theres a dds plugin for photoshop, but tga just wont open, il try later with Graphic Convert( after i found it

Packing.
To pack all folders again to the .iwd file, simply select all the folders inside the main folder:

And ZIP them, using Stuffit or a other program, does not mather.
After you packed them, change the name to the original, iw_13.iwd in my example, then place it in the /main/ folder.
More stuff will be posted soon, if you find out a good program to edit the image files, do post a link !