The 1.17f patch is the latest official patch for the game. It fixes many of the crashing issues that earlier versions had, increases multiplayer stability, enhances the avionics\flight model, adds Direct3D support, along with many other things.
ForceDirectDrawEmulation = 0
ForceDirectDrawEmulation = 1
9. Start up F-15 and go to the Options menu. Make sure 3dfx Glide (Voodoo) is highlighted in Video Driver. F-15 will now play correctly.
Note: Instead of using regit.exe this can also be accomplished by manually adding it as a new string value directly to the Windows registry in the location cited above.