Xbox's new PC emulator isn't emulating the original Xbox. It's emulating an Xbox 360.

Microsoft has switched on Xbox Backward Compatibility for PC, bringing four original Xbox games—BLiNX, Conker: Live and Reloaded, Crimson Skies and Fuzion Frenzy—to Windows and handhelds for the first time. But engineers digging through the files found Microsoft isn't emulating the original Xbox at all. It's running the Xbox 360's emulator, which suggests the 360 library could follow.

Xbox's new PC emulator isn't emulating the original Xbox. It's emulating an Xbox 360.
Microsoft has switched on Xbox Backward Compatibility for PC, bringing four original Xbox games—BLiNX, Conker: Live and Reloaded, Crimson Skies and Fuzion Frenzy—to Windows and handhelds for the first time. But engineers digging through the files found Microsoft isn't emulating the original Xbox at all. It's running the Xbox 360's emulator, which suggests the 360 library could follow.