UI

[Shadow]

You are correct, the ctx files are compressed versions of the original tga files. If you add a tga file, the game will automatically convert it to a ctx file though.

There isn't a way to get the original tga files right now. However, I've already added a new console command in version 1.010 that will let you uncompress all of the tga files from the ctx files. So soon you will be able to get all of the textures and modify them all you want.