Hmmm...
As far as I know, some even claimed to have run Drivers under several Windows.NET Server Beta's, but I've never seen any dedicated 3rd Party Drivers for that.
Admittedly, those really aren't Gaming OS'es anyway
What problems did you encounter with the existing Win2k/WinXP Drivers exactly ?
I guess the Key to that might be to modifiy the .inf to compensate for different OS Label, and not unlikely for Registry locations.
I don't know how this OS handles OpenGL, but copying the 3dfxOGL.dll into the Game's main Directory and renaming it to opengl32.dll (if that's still the default name) might help ?
Glide 'should' work completely independent from that, and copying the Glide Files into the Game Main Dir might help as well (in case the default GFX Driver locations changed in that OS, which can easily make a Driver tumble and fail)....