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I just found my old CD of Realms of Arkania 3 : Shadows over Riva (in Germany a.k.a. Das Schwarze Auge, Nodland-Trilogie Teil 3: Schatten über Riva), installed it under WinXP, and started it with DOS-Box. Now it said it requires the CD, and no CD drive is to be found.
Then I tried to run it under XP and it worked, but I can't move the mouse during gameplay unless I click the right mouse button, and there won't be any sound, only music.
So how do I make DOS-Box recognise my CD-drive?