Modifying GLD (Glide) files

[Tripredacus]

Besides working with WDS I also have a hobby of modifying computer games. The current one I am researching for uses a modified Glide engine (OpenGL really) and I have been able to figure out all the files except these GLD files. It is a 3D game and I have already learned how to change the textures and the models and what not, but I'm now looking for the texture map, which I am betting is in these GLD files I have found that have the same filename as the base models that the game uses.

But I am at a loss as to trying to find ANYTHING that can make, import, view, etc them. The only thing I have to go on is that the file header (in hex) says BILG, but I'm still not able to figure it out.

If anyone has any ideas, let me know.