Musescore quit unexpectedly and now it won't open the file I was working with

I was working on a transcription for string orchestra, and when I was done working on the score, I extracted the parts. Suddenly, Musescore quit unexpectedly before I could save the parts. Afterwards, I could not even open my original file. I really need to be able to open this file to finish the arrangement! I tried downloading the last nightly build to see if it would open the file, but it didn't help. What else can I do? I am attaching the file in case anybody can solve this problem. Thanks!