There's specific dev hardware designed from the ground up to do these things, even when they were normal computers some things such as the graphics systems were non standard and were only used in equipment development for Xbox games. In fact most development cases of games are all done with dev equipment which was used to test the use case of the hardware before finalizing and sending the game to be printed out. Even the OG Xbox dev hardware was a computer that used proprietary dev hardware to make its games and test them.
What you are talking about is something more akin to Bleem for the PS1 which since OG PS1 games were accessible on decent enough CD drives at the time this made it not too hard to accomplish. Modern games use different pressing techniques and formats that make it irregular for normal PC users to find accessible. Hell I am pretty sure they all run a special type of Blu-Ray format for most modern games, which is very rare for most PC's to have. Hell most PC's that have been coming out for the last few years now lack an optical drive. I don't like that but that's the trend.
Finally, even if what you say is even remotely possible, if it was done by Xbox official the library will be restricted as hell since a lot of previous games will need to have to go through re-licensing, which some games will just not do in this day and age. (RIP Simpsons Hit & Run and the Matrix games)