premise: Secret Files 2: Puritas Cordis (original German title Geheimakte 2: Puritas Cordis) is a point-and-click adventure game developed by Fusionsphere Systems and Animation Arts and published by Deep Silver for Microsoft Windows, Nintendo DS and Wii. It was unveiled at the 2007 Leipzig Games Convention. It is the sequel to the 2006 point-and-click adventure "".
hypothesis: Secret Files 2 is available on Windows, Wii, Xbox and Nintendo DS. 
reason: The statement says its available for Windows, Nintendo DS, and Wii. I think the system saw the other systems so assumed the xbox was included. 