I was trying to find the info myself & the only relevant thing google found was your post. I am gonna take a wild guess & say its probably for the backwards compatibility for XB1 cuz some of the games they said would work "right away" don't show up on my XB1 like Small Arms, Hexic & another Ican't remember ... But all others do ... But I am stupid & don't know anything so I wouldn't trust me ... Cheers!?