lost document

Hi,

I had always two documents opened that I was working on. After an update from windows, I can’t find one of the documents (the other one just automatically opened when I opened my Scrivener). I actually don’t remember choosing a place where to save them, Scrivener was doing a backup when I was closing the documents (and I did close them before the update).
Hope there’s a way for me to find my document back.
Loupette