But the few that have made it to the Microsoft Store have been pulled down ever since the company made changes into their Terms of Service, banning the ability for developers to sell emulators via their storefront.
For a few years now the Xbox One has been capable of running emulators. Sounds strange, but consider the following: Besides your backwards compatible Xbox One, Xbox 360, and Original Xbox titles, you now have access to a vast array of emulators that let you get back to games that are likely older than you. I love video games so much, I spent $500 on November 10th to play a bunch of old games.