The original CD audio has been added to the game files.
You will find a folder called "Clans music", and the audio files are in there. The interesting feature of this particular game is that the contents of the original CD contained only the music for the game. Then you will have to burn an audio CD and put into your CD drive. Have fun! When you launch Clans, you will see a window pop up: "Please insert the CLANS CD! Features: 7 Levels: At the Gates; Underdark, a cavern realm of molten lava; Chambers of Torment, the dungeons of the fortress; The Commoners Quarters; Garden of Eternity, the fortress courtyard; The King's Quarters; The Dragon's Den Wage war with swords, axes, magic, and explosive weaponry through nine quests, seven levels and five sublevels of the ultimate hack-and-slash action.