Simple way: Just make a full Image with Alcohol 120 (ca. 1,3 GB). Mount the Image with Daemon Tools 3.47. To play Civ IV just start SafeDisk 4 Hider (you get it at g a m e b u r n w o r l d . c o m) . Now you can start the game and play it without DVD.
This solution works fine. By the way - itīs better than a no CD: there are some bugs, so I am waiting for a update. This solution will work with future updates, I hope . . .
Greetings, 007