If you put the expansion pack for oblivion into an Xbox one it plays like regular oblivion and downloads the DLC too, whereas before it just served to download the DLC to
Oblivion DLC (The Wizard tower) - Microsoft Community
Save 75% on The Elder Scrolls IV: Oblivion® Game of the Year Edition on Steam
Final Oblivion DLC content, Fighter's Stronghold, to hit PC/360 next week – Destructoid