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.

 

Tim_Prest_0-1631820541517.png

 

I am using Windows 10 and Microsoft 365 Version 2108.

 

Would appreciate any help you could offer me.

 

Many thanks

Tim

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