I hope you had resolved this in the best way possible. I did what the player below said, but trust me, save your saves, I almost lost mine literally.
The exact same thing happened to me today. Opened, noticed that my custom loading screen was off, and then the game opened like it was the first time I ever played it. No resume, no custom content turned off.
I have The Sims 2 and 3 and they too had this problem. New folders created, configs restored, like I had installed the 3 games and was playing for the first time.
then I opened my explorer and it was all there in their folders, and thanks to the explanation below I checked and found new folders.
Like… what??? Why. Just. Why?
long story short, I’m manually putting everything in place, but I still don’t understand why the app duplicated. And the worst thing is to “move” everything again and having doubles of everything.
erasing is out, because if we get the “original” files back and I lose everything again? For real.