Word is not allowing to open any file.

Try these steps in order:

1. Open the file with Open and Repair
   • In Word, select File > Open > Browse.
   • Go to the file location.
   • Select the file, then select the arrow next to Open.
   • Select Open and Repair.
2. Start Word without add-ins and templates
   • Press Windows + R.
   • Type winword /a and press Enter.
   • If Word opens this way, the issue is likely related to an add-in or template.
3. Insert the document into a new blank document
   • Open Word and create a Blank Document.
   • Go to Insert > Object > Text from File.
   • Select the file and choose Insert.
   • This can recover the text while leaving behind a damaged final paragraph mark.
4. If the file shows as locked for editing by another user
   • Make sure no one else has the document open.
   • Close all Word instances.
   • Open Task Manager and end any Winword.exe processes.
   • In File Explorer, go to the folder that contains the document.
   • Delete the owner file that starts with ~$ and matches the document name.
   • Open Word and try the document again.
5. Check for Office updates
   • In an Office app, go to Help > Check for Updates.
   • Turn on Automatically keep Microsoft apps up to date.
   • Select Update and install all available updates.
6. If Word itself is failing to start or keeps showing an error
   • Restart Windows.
   • Run an Online Repair for Office from Windows Settings. This can reinstall Office as part of the repair, so make sure the Office account is available before starting.

If the problem happens only with one document, the file may be corrupted. In that case, Open and Repair or Text from File is the best next step.

References:

• Open a document after a file corruption error
• How to troubleshoot problems that occur when you start or use Word
• "The document is locked for editing by another user" error message when you try to open a document in Word
• # Error: [Filename] uses a file type that is blocked from opening in this version
• word is not opening - Microsoft Q&A Hi Team,
• Context Word not opening - Microsoft Q&A My MS word was working fine until tonight. When I open any word file, it says my word run into an error that is preventing it from working correctly. But nothing works even after clicking on repair now button