I've recently updated to Substance 2022 (Designer and Painter). I've found that several of my Designer projects don't open, because it can't find some "alphas" I was using, that were part of the Substance Painter shelf. One example is: "square_rectangle.sbsar". I've tried searching for this, and although I still see this alpha within Substance Painter, I can't find the SBSAR file on disk to point Substance Designer at.
Could someone tell me where these files ended up? These aren't my own custom alpha. They're built-in to Substance Painter, but I've having trouble finding them on disk.