Project .fla file won't open

Animate 2021 can't open a .fla with "An error occured opening file" message showing up. I've already tried the WinRar fixing method and searched through ...\AppData\Local\Adobe\Animate 2021\en_US\Configuration. WinRar just can't fix the file and the Configuration folder does not have any data. Weirdly enough, the file size is pretty big (205MB), so I guess the data is still there. I can send the file itself if someone knows another way of fixing a .fla other than the WinRar one.