This is one of the many unofficial level collection cds. Only the readme is in German, the rest of the content is English. It contains levels, tools, graphics, cheats and so on. The games for which there is material on the cd are: C&C, Doom 1+2, Duke3d, Heretic, HeXen, MechWarrior 2, MS Flight Simulator, NBA Live, Quake, ROTT, Sim City, Sim City 2000, US Navy Fighter, WarCraft and WarCraft II.
The .iso has been converted from the original .mdf/.mds.