All of the Nehe demos worked perfectly for me except for the last one (Nehe21): the data/* files had to be renamed to be all lower case F.E. Complete.wav must be renamed to complete.wav.
Fixed !
The game played so fast the only thing I could do was draw a box on the outside of the screen
There are no limited frame rate for this game, so more fast is you cpu, more fast is the game…
++
Chman