HELP ME! Unexpected file format

“Unexpected File Format.”

I kept working on the file, but there was an error today.

Is there a solution? I hope you’ll help.

It’s a huge file. I am on SU 2019 and it won’t open for me either. I get this message:

54

Is the file stored on a cloud location such as google drive or dropbox?
It is best to place it on your local machine (desktop) and work from there. As you continue to work, filesize increases and with Autosave turned on, the syncing software might fail…
Server timeouts, AV-Software etc. all come in play.

Maybe there is a version/backup somewere

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