Well before the update, there used to be a lot of zipped folders with different files for different window designs etc, then after the game update the different files like the right side slim didn't work anymore.
Since then I have reinstalled the game and profit for other reasons, and now those zipped folders don't even exist anymore. I assumed it was cause they don't work anyway.
I still have the old files backed up. but yeah they still don't work. Hope this all helps