Borderlands isn't exactly open world tho.
Games where you can literally go anywhere you want (that includes buildings) and pretty much interact with anything/anyone in the environment would be The Elder Scrolls series. Morrowind, Oblivion, and Skyrim would be good ones to check out.
Except he did not want to run bootcamp...
Dang, I forgot about that, you're right. Eh, Cider/Wineskin?![]()