WoW Folder Structure

[bsmorgan]

Battle.net has updated my system and I was expecting _retail_, _classic_, and _bcc_ (or similar) folders in the "World of Warcraft" folder. Instead I've got a new _classic_era_ folder instead.

When I selected "World of Warcraft Classic" in the Battle.net application, the button said "Install" instead of "Play" or "Update".

Which folder contains which version of WoW? I now have two flavors of my addon, Skillet-Classic, and I need to know which flavor goes where.