Aviutl no longer opens project file

QueenKiwi

Momo's Minion
Hi

So I've been editing a video in Aviutl the past few days but since this morning I haven't been able to open the project file and keep getting the error "file format" is not supported despite it being the same extension as usual. I was able to open other project files so I know it's not the program itself. The only problem that may be causing it is the size of the file itself 670kbs which is larger than I usually do but other than that I have no idea why it refuses to work all of a sudden. Any suggestions what it might be and how I can fix it?

Thank you!
 

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