Where is Preview.app's .savedState?

Since Mac OS X Lion introduced the Resume feature, where applications save their open windows and document states, compatible applications have stored their window states to disk in the directory ~/Library/Saved Application State, in directories like com.apple.finder.savedState. However in my Saved Application State directory, there is no com.apple.Preview.savedState. When I launch Preview.app, it does remember all its open windows and their states, but I cannot find where the state is stored on disk. It does not appear in the usual location. Can you help me find where Preview.app is saving its window states?