Since you closed my other topic i will open this one to report my findings:
i have not cheked yet the swapping of the levels on the demo (i'm waiting to get a copy of call of duty 2 since i'm not into piracy) but i played a little bit with the files, maybe others have already discovered this but those are my findings:
-the demo will boot as a standalone game
-the demo will boot even without the sound folder (and some sounds will still works but in an odd way)
- if you remove the media (like images and videos or sounds) it still seems to work, in one of my burned dvd-rw it booted without the loading screen image displaing a sort of checkerboard instead of the same old explanation of the controls.
I think that the executable has pointers to the required files but no error handling if one of them is unreadable, if a file is missing it's simply ignored