Alternatively:

1. Rename the file and remove the .xlsx or .xls extention etc e.g. if my file is called test.xlsx I remove the '.xlsx' - you will get a warning message saying this could make the document unstable - accept it
2. The document icon should now have turned white (the document won't look like an excel document anymore)
3. Open a blank excel document by hitting start -> all programs -> Microsoft office -> excel (this may be different if you’re not on windows 7)
4. In your blank excel document hit file -> open
5. Navigate to the document you renamed above and select it, now click open
6. It should now open the document
I hope this helps someone, if not, visit some authoritative resources...
http://www.filerepairforum.com/forum...-on-excel-2010 - any info about corrupted excel files
https://excel.recoverytoolbox.com/ Recovery Toolbox for Excel - paid, but fast and very effective tool
https://social.technet.microsoft.com...at?forum=excel - solutions from MS IT professionals