I bought the upgrade to Music Maker 2022 Premium while I was working on a project in the 2021 version. I managed to open the project file in the new version without any problem. However, at one point while I was working on it the program crashed. I reopened the program but when I reopened the file it was empty (I just got the empty MMM start screen). When I checked in the folder the file still had the size I would expect (just over 1.5 MB). There are also three BAK files, so it seems that the file had several backups. In the properties of the file I didn't find previous versions of the file. The last modification is from around the time I lost the project. I tried a couple of things (up to restarting the computer), but no success. Other MMM files open without any problem. Is there a possibility of opening the file from the BAK files (backup)?