opengl for 3dfx voodoo2

i have diamond monster II 8mb and i want to “install” opengl support for it (win98) to paly for example warcraft III or to develop programs using opengl.
and what for is 3dfxvgl.dll? how can i use it? i tried to do something in win registry with thif file, because i have diamond viper 330 (riva128) primary card which has opengl support and it has its own vprogl.dll set in win registry.