TexMod is the program that extracts the necessary files from the game (in TGA, BMP, JPG, PNG, DDS etc format) and uses them after editing. This program gives you the option to preview the textures in the game before extracting.
Download from:
http://www.tombraiderhub.com/tr7/modding/- - -
How come I haven't think of this before.. This thing is pretty simple to make. TexMod runs the game and checks every loaded texture in memory. Once it has info about textures in memory, it can save them back to disk.
(I guess the program lies in margins of legalism. Wink wink Sylv, you decide what to do with this thread)