The four original Xbox titles made available for "Backward Compatibility on PC" are using a double layer of Xbox console emulation. The new backwards compatibility layer is an Xbox 360 emulator operating with XeFu, the original Xbox emulator designed for the 360. Developers can run dumped backwards-compatible Xbox 360 and Xbox Original games on PC using Microsoft's PC port of XeO3 and components of XWine1. This approach reuses existing technology rather than creating a new emulator from scratch. The XWine1 project indicates that it is possible to run other original Xbox and Xbox 360 games on PC, although success may vary.