I follow /r/xboxone on reddit and this popped up the other day.  A guy has managed to make Microsoft’s Xbox browser, Edge, play roms due to its javascript support.  Simply upload any rom for gameboy, NES, sega, snes, to your onedrive account (obviously for legality you need to already own said game), open the browser at:
https://nesbox.itch.io/x1

And the Xbox will launch the emulator.  Select the Rom and happy days!  Here’s Sonic playing a demo: