Excel cannot open file

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Occasional Visitor

Seems after I "upgraded" to Windows 11, quite a few excel files now give me the following error message when I try to open:

 

"Excel cannot open the file because the file format or file extension is not valid.  Verify that the file has not been corrupted and that the file extension matches the format of the file"

 

Appreciate any help resolving.  

 

Thanks!

Mike

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