Xbox OS is a custom version of Windows 10
And yea, they have emulators compiled with the games, like SNES on Wii U. Basically I'm asking for those emulators to be reverse engineered to make a sideloadable UWP app which can boot from disc like PS1 emulators on PC let you do. Or some sort of injection tool, though the latter might be detect and banable and there's the matter of acquiring ISOs, whereas a UWP emulator running in dev mode shouldn't breach anything.
Reason I care is I'm planning on buying an Xbox One S after making the mistake of selling my OG XB1 last year, and theres a few niche 360 games that I've previously played/discovered after selling my 360 that are unlikely to be added, and I don't have the space for a console dedicated to a couple of games that the Xbox One is neglecting.
I do hear that there is a PC emulator making leaps, maybe if there's some way for me to read 360 discs on my computer that's another option.