The MindMaze game from Microsoft Encarta 94 to 2007 was hidden in later versions via the Ctrt-Z shortcut, which in the case for the later versions of Encarta was the only exception for Microsoft's Easter Egg policy in software at the time. MindMaze would get cut in both Encarta 2008 (from 2007) and 2009 (from 2008), a two year gap before Encarta was discontinued by Microsoft in the year 2009. Also did you know that 7-Zip can open Encarta .EIT files and can extract the contents from them as well, and yes it works.