Texture files for the new units of the Griffin Empire from the Hammers of Fate.

What's the point of struggling – just buy the third expansion, Tribes of the East, and don't waste your time.

Nope. It's all about the process itself. I can redraw the skins, adjust the stats, and even modify the geometry (if I can)... But buying an expansion is the easiest option.
So, you don't know where those textures are located?