The reason 3dfx came into my head is because they made use of the Glide API, and Voodoo cards were made to run with this very well---which they did. 3dfx was a company that produced a series of video cards called Voodoo (2,3,4,5), and used to be the king of graphics. Unfortunately, due to some problems getting the Voodoo 5 out on time among other things was ultimately fatal. What's left of the company is owned by nVidia.
3dfx cards used their own implementation of Open GL, called 'mini GL'. I'm not sure how the Quake 3 engine was prepped to handle this, but when Quake 3 came out originally, 3dfx was still alive and beating, thus support was still in full swing for the Voodoo cards.
Why that file is attempting to activate could be part of a routine it does. I don't have MOHAA, but I do have RtCW and a demo of Quake 3. I see if it runs that same sequence or not. I suspect it does, but I don't know for sure.