Help please. Excel unable to open a file as the file format or extension is not valid

Occasional Visitor

Hi all,


My computer shut down unexpectedly and I have since been unable a file.


It is one that I rely on heavily and would like to do all I can to get this back.  I have been through a few different fixes that I have found on this site but so far none have worked.




I am using Windows 10 and Microsoft 365 Version 2108.


Would appreciate any help you could offer me.


Many thanks


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