These files are what you need to get the Time Warriors Demo to work for 3DFX cards. 

If you haven't done so already, get the demo (for Mystique) at:

ftp://ftp.matrox.com/pub/mga/mystique/games/demos/timedemo.zip

Extract this to a directory. 

Now extract the two files in time_3dfx_addon.zip to this same directory.

Run setup.exe from Windows and choose "3dfx" from Hardward Acceleration menu.

Change the sound setting to "16-bit", save setup, and hit "Play".

An error message about CD audio will pop up...hit OK to ignore it, and away you go!