For invulnerability in this game, use the DOS utility DEBUG.
 First backup your game to be edited, then type the following
 from the dos prompt: ([VGA] game cheat only!)

 ren e:\cfs.exe cheater.cht
 debug e:\cheater.cht
 e 3efa eb 07
 e 3f0f 90 90 90 90 90 eb 1d
 e 3fd6 c3
 w
 q

 Then rename CHEATER.CHT back to its previous name.