Problem repairing excel file in office 2010

Hello,
I have a problem with one of my excel file, I was working on file in excel and computer suddenly restarted due to electricity fluctuation. After computer restarted, I try to open the file but it gives error.
"Excel cannot open the file 'myfile.xlsx' because the file format or file extension in not valid. Verify that the file has not been corrupted and that the file extension matches the format of file."
I try to repair the file using repair tool of Excel 2010 but it is useless. I also tried different software to recover corrupted excel file but all useless.
Does anyone has solution to make my file useful.
Regards,
Syed Muhammad Ali

Hi,
In Windows 7,
Right-click on the workbook and then select Properties. Select and restore the file under Previous Versions tab.
Best regards,
Rex Zhang
TechNet Community Support

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Problem repairing excel file in office 2010

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