Do you see this when you open the document by double-clicking its icon? If you start Word first and then open the document via File | Open, then does it display in a readable format?
If using the Open dialog box works, then something has happened with the filename extension for the problem file. You should be able to resave in Word format and then just delete the original file.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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