I'm wondering if anyone else is having the same problem. Basically, while I quite like the idea of the Resume feature, I don't like having it enabled system-wide, so I've locked my "~/Library/Saved Application State" folder in order to prevent applications creating folders inside, except for the ones I want (programs like browsers mostly). Anyway, this works fine for the majority of programs, however, Preview seems to use some kind of non-standard mechanism for restoring previously opened documents, and it's driving me crazy, as most PDFs I view are really large files, so it means that forgetting to close one before quitting can make Preview really sluggish to open. However, locking the application state folder has had no effect on it, meaning it must store its state somewhere different, and disabling the the re-open windows settings using defaults write in Terminal has had no effect either. Does anyone know where Preview keeps its application state? It's really annoying that it seems to use some kind of secret method rather than the same Resume system that every other app uses.