This deal is from OzB
is a multi-emulator front-end including consoles up to PS2 and Wii. 3DS, Wii U, Switch, etc are currently not possible on Xbox.
- Xbox One consoles can play from NES up to PS1 games.
- Xbox Series consoles can play from NES up to DreamCast, GameCube/Wii and limited PS2.
- Go to https://gamr13.github.io using Edge on the Xbox and click on each to install the apps.
- Use the FTP app to copy over the required BIOS files and Roms (these can't be linked to here and you should legally own these to do so).
Make sure you check out DuckStation (either standalone or in Retroarch). Even the OG Xbox One can upscale PS1 game to 1080p at 60fps. It looks gorgeous.
Video tutorial: https://www.youtube.com/watch?v=dV9GyKicrAg
Retroarch and Duckstation are open source.