Slave Zero is a 1999 Infogrames video game for the Sega Dreamcast and Windows ME.
The game was originally designed to work with Windows ME. A fan following has developed a number of CD cracks in order to make the game compatible on newer systems. While this allows the software to become playable, it still requires that the owner possess the original software. The PC version uses the Ecstasy Engine. On March 25, 2014, Tommo Inc. re-released the game on GOG.com.
Source: Wikipedia, "Slave Zero", available under the CC-BY-SA License.