Need help identifying a file type

For a few months now I've been working on modding a game, and my recent project was attempting to add additional textures onto the 3D models, but I've having some difficulty.

The game engine is written based on a modified version of Glide (or modified OpenGL but it doesn't seem to fully support that) and I have a working understanding of the models and textures, but can't seem to find the part that binds them together: the texturemap.

I've scoured all the files and am left with 6 files with the file extension of .GLD. Researching this type of file only tells me it is a Glide (3dfx) file but nowhere can I find any viewers/convertor/decompilers/etc for them. The only other lead I have is that the file header says "BILG" but that doesnt tell me much either.

If anyone has a lead for me, I'd like to hear it. Thanks.

You're working with an engine that relies on Glide? Where did you find this engine??

Google Glide API or look it up on Wikipedia. Summary: It's an obsolete Voodoo card 3d API. Got a bit of traction because Voodoo cards were popular some time back.

Get a better game engine. One more modern anyway.

Yea I know all about 3DFX and its great wonders it had created... like SLI...

Eh I know how horrid a game using this sounds... but its the engine used by Electronic Arts in their EA Sports titles...

Its horrible enough as it is, since it doesn't support anything besides lightmap, barely supports alpha channels, can't find ANY way to implement reflection maps, uses a proprietary modelling system which appears to have support for skeletons but can't find where the skeletal data is (probably doesnt use it). The models themselves use 1 shape with morphs to handle animation.... Its a really outdated engine the more I figure it out. And they wonder why their games don't sell very well on the PC...

Basically I'm trying to get a new texture layer to appear on part of the model that doesn't already have a second texture layer assigned to it. If I can find the texture map data I can determine how to place the new layer based on the old layer information. Its just not in ANY of the files I can work with, and all I have left are these GLD files.

I'll check with the API idea...