I have a problem with a file I’ve been working on for some time. I last saved the file on a Friday, now on Monday I can no longer open it. the message “unexpected file format” appears. I got an auto save .skb a few hours before the last time I saved it. But in two hours much would be lost. I noticed on another topic that this problem is nothing new. And that has been recovered at other times. Can you help me? I would be very grateful.