Cannot open AUTOSAVE and original file is corrupted
I am writing a piece of music, and if I have the file open when my laptop runs out of battery, it gets corrupted. This has happened before, but usually it is autosaved. If I open the autosave file, I can continue work as normal and simply replace the corrupted original. This time, however, Musescore 4 tells me that autosaved file is an unknown filetype. Since the original is corrupted, that means I can't access my score at all! I have tried repairing Musescore 4, opening the file in Musescore 3 and everything else I can think of, but nothing works! Does anyone know how to fix this? All I have is an old PDF file of the score, but that is pretty old by this point, and would require me to rewrite a lot of stuff.
Here is the corrupted file: Untitled score.mscz
I can't add the autosave file here for some reason.
Thank you for any kind of help on this!