both articles seem to suggest that this is only (or primarily) affecting ubisoft games, which suggests that ubisoft might share some of the blame here. microsoft is very dumb for pushing out an update that breaks a ton of games, especially given how much they claim to love backwards compatibility. but ubisoft is also dumb if they are relying on undocumented APIs, as some of the other comments suggest they might be. microsoft already struggles to keep their documented APIs stable, so i can only imagine what happens with the undocumented APIs