DLC in Oblivion anyway. And it still svcked. And I also thought it was pretty funny.
Okay. Further explanation.
DLC in the sense of how the industry sees it on a console marketplace. I,e how much would people be willing to pay for this or that and what type of content would they be interested in. I'm speaking from interviews they have done. Hell, Pete talks about it in the latest Bethesda podcast.
Other example DLC does stand for Downloadable content. BUT, we differentiate it to only meaning smaller things. Mehruns Razor is DLC. Shivering Isles is a Expansion.
Technically SI is content you download but it's not referred to as such. They had done official plug-ins in the past. But those were free. So, yes. Horse armor was the first DLC for them.