Cannot open DOCX. files in Microsoft Office 2010 Starter

I have Microsoft Office 2010 Starter.  Suddenly, all my files are in docx. format, and I cannot open them.  I get a message saying I need to purchase Office.  Why has this suddenly happened?  How can I change it back?
 

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Last updated September 6, 2019 Views 62,739 Applies to:
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Answer

This suggests that the file association has been damaged. See this post for repair instructions.

Microsoft MVP (Word) since 1999
Fairhope, Alabama USA
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