Heres a Beta Release of a Original Xbox Emulator for Windows, heres the release notes:

XQEMU Git (2018/03/10) is compiled. XQEMU is a open source, cross-platform emulator for the original Xbox (and Sega Chihiro). It is currently in very early stages of development. XQEMU is built on-top of QEMU.

XQEMU Status
* Most things don't work
* Everything is slow
* No audio

XQEMU Git Changelog
* Merge branch 'fix-fifo' into xbox
* cleanups
* cleanups
* fix
* fixes
* wip
* wip
* wip
* Merge pull request #6 from LukeUsher/fix-build-on-new-perl
* Fix compilation with perl > 5.22

more info