I'll give some hints: Put in the cd, the game starts, intro is playing and all buttons are enabled...fine..remove cd and try...what? No intro movie and single player not clickable....hmmm...pretty much looks like it's looking for the intro.kdv file (which is not installed on harddrive), then some checking for CD and the correct Volumelabel...if everything goes well, it will put an "1" at a pointer
and you're done...
Now, grab a good disassembler and have a look.
