Does the compatibility work with cut games?
I redeemed the codes for Rainbow Six Vegas 1 and 2 which came with Siege and I could download Vegas 1 but Vegas 2 does not show up. I checked on the xbox website and it shows me that I have purchased the RB6V2-DE (german cut version).
The cut German version likely has a different disc ID and as such, isn't matching.
Xbox 360 codes are region free. They redeem based on the region of the account used.
It's kind of a hack, but if you reach out to Ubisoft support and complain that the code didn't work, you should be able to create a US account, set it up on your XBO, have it set the XBO as your home console and then redeem the replacement code on that account to get the US version, which would then show up under BC.
But you just said that MCC was two remasters... both of games over 7 years old, and one of them was a standalone remaster of a 10 year game originally (to which you can also add Fable Anniversary).
Neither was Perfect Dark.
Nor were Banjo and Banjo Tooie
Banjo, Banjo Tooie, and Perfect Dark are all running under emulation on Rare Replay.
If I put a European copy of a compatible 360 game into a North American Xbox One, will the backwards compatibility work?
It depends on the disc id on the disc (some games used the same id worldwide, others were different). The current region of the account may also matter if the system is only checking against current region disc ids (I haven't tested the latter so that is just a guess). If a given disc doesn't work, try changing your region on the XBO to the European store and then try again.
wouldn't the easy way around this be to just make 4 different files, one for each disc, for lost odyssey, for example? it would be a bit clunky in the library but then you would also have the option of not downloading all 4 discs at one, too.
so no need to mess with any of that stuff, just have the 4 different file labeled disc 1, 2, etc in the library and then call it a day. Sure, that would be inelegant as fuck but it theoretically should work
Not with the way the emulator is currently setup.
And I should amend my last comment slightly.
Multi-disc games with only one "play" disc (where all other discs are simply "install" discs) could also come to BC fairly easily under the current setup.
The real hitch is multi-disc games where every disc is a "play" disc and you have to swap discs to continue playing and where a version of the game does not yet exist as a GoD.