Excel cannot open the file beacuse 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 [help]

Hi,
I have a excel file that I have been using since beginning of year.
Yesterday, I tried to open it but a message comes out "
Excel cannot open the file beacuse 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"
After I click yes, the page is blank. The file is about 400kb in size.
I have try open and repair and third party repair program and not working also.
I would appreciate a lot if you can help me.
Thank you very much.

Per your post, this problem might be caused by malware on the affected machine.
http://blogs.technet.com/b/the_microsoft_excel_support_team_blog/archive/2013/09/07/quot-cannot-open-the-file-because-the-file-format-or-extension-is-invalid-quot-opening-office-files.aspx
In order to clean your machine, run Microsoft Safety Scanner (http://www.microsoft.com/security/scanner/en-us/default.aspx) to kill the malware, and then repair Excel file itself.
If this is not the case, feel free to post back and let me know. Thanks.
Tony Chen
TechNet Community Support
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Excel cannot open the file beacuse 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 [help]

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