Old op has had a face lift to become an official Retroarch thread 
:yayone: Official RetroArch Xbox One Thread :yayone:
Grab the latest build at the bottom of this post
RetroArch is a multi-system frontend which allows you to run many different emulators and other programs ("cores") through a unified interface. There are currently more than 50 different systems supported on the Xbox One. Retroarch is Being ported to the Xbox by @krzys-h and is still considered unofficial and beta
https://github.com/krzys-h/RetroArch
Currently all Homebrew on Xbox One requires a Dev Mode account to run.. If you already have Dev Mode enabled on your Xbox One you can go ahead and install the APPX (plus it's Dependencies file) through the Xbox Device Portal
RetroArch source
You'll need:
The cores listed below are known to work well on Xbox.
Why isn't core X supported? Can I run X?
Want additional information regarding RetroArch?
Visit the official release page:
https://www.libretro.com/
[Latest News]
Retroarch 1.8.5 Released!!
Two new Cores.. ECWolf (Wolfenstien 3d Core and X1 Core)
LINK
(OP is a work in progress, current maintainer is @ploggy, @ me if something needs to be added or fixed!) + thanks to @Shadow0ne333 for the copy/paste of his Retroarch OP
+ Thanks to @dominater01 for uploading his APPX builds and his Youtube Vids Thanks to OsirizX for getting the Dolphin Core running + lastly thanks to @krzys-h and the Retroarch Devs for bringing Retroarch to us lowly Xbox One users
:yayone: Official RetroArch Xbox One Thread :yayone:
Grab the latest build at the bottom of this post
What is RetroArch?
RetroArch is a multi-system frontend which allows you to run many different emulators and other programs ("cores") through a unified interface. There are currently more than 50 different systems supported on the Xbox One. Retroarch is Being ported to the Xbox by @krzys-h and is still considered unofficial and beta
https://github.com/krzys-h/RetroArch
Currently all Homebrew on Xbox One requires a Dev Mode account to run.. If you already have Dev Mode enabled on your Xbox One you can go ahead and install the APPX (plus it's Dependencies file) through the Xbox Device Portal
Quick Links
RetroArch source
Basics
You'll need:
- A Dev Mode account. Some say it's possible to acquire a free Dev Mode account but that may no longer be the case..
https://gbatemp.net/threads/dev-mode-activation-free-for-now.528076/page-2#post-8518960
If not then a Dev Mode account may need to be purchased for $19 USD (one time purchase)
https://docs.microsoft.com/en-us/windows/uwp/xbox-apps/devkit-activation
- Retroarch APPX + Dependencies file. (latest Release will be at the bottom of this post)
Setting up XMB
If the menu icons are not loaded when you start RetroArch, you're missing the assets package. Navigate the menu and go to "Online Updater" and select "Download Assets".
What cores are supported?
The cores listed below are known to work well on Xbox.
Frequently Asked Questions
Why isn't core X supported? Can I run X?
First, check out the compatibility list above. NOTE: Some Cores such as Citra, Mupen64, Reicast/Redream require an OpenGL renderer to function which currently the Xbox One doesn't have. Until ANGLE (translates OpenGL calls to Direct3D) is ported to Xbox One don't expect to see these Cores running.
Want additional information regarding RetroArch?
Visit the official release page:
https://www.libretro.com/
[Latest News]
Retroarch 1.8.5 Released!!
Two new Cores.. ECWolf (Wolfenstien 3d Core and X1 Core)
LINK
(OP is a work in progress, current maintainer is @ploggy, @ me if something needs to be added or fixed!) + thanks to @Shadow0ne333 for the copy/paste of his Retroarch OP
+ Thanks to @dominater01 for uploading his APPX builds and his Youtube Vids Thanks to OsirizX for getting the Dolphin Core running + lastly thanks to @krzys-h and the Retroarch Devs for bringing Retroarch to us lowly Xbox One users 
