User blog comment:Saratje/PC release date explained - Skyrim: Dragonborn DLC/@comment-81.144.132.166-20130107093756

bethesda changed the names of their content from dlc to plugin etc to complyly with microsofts demands, probably another way to irritate ps3 users, and to get to sony. bethesda  did all of this because microsoft flapped its 'thing' at them which happened to be wrapped in money.