Without actually seeing the file, there is not much we can do to confirm whether the contents can be recovered or not. But you could start the investigation to see if the basic structure is intact.

Make a copy of the file and then change the file extension to .zip

When you then open the file, does it reveal a folder/file structure with folders called word, docProps, customXml and _rels? If so, the content may be recoverable.

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Andrew Lockton
Chrysalis Design, Melbourne Australia