Better example;
I have a modded hood I am playing with. kha_mask01 is the uti and object ID. However, the mdx, mdl, and tga are named i_mask_250.
How does kha_mask01.uti know how to pull from a completely unrelated-ly named file?
That's what I'm having an issue with, how do I insert the new texture into the uti? I'm not seeing any way to do that.
I'm going to test out what I think you are saying, and see if it works.