Excel spreadsheet gets error "Excel cannot open the file .xlsx.." How can I "uncorrupt" this file

Hi,

After a power outage a particularly important file gets the error "Excel cannot open the file.xlsx beacause 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. The file format has not changed. Is there a safe free program that can uncorrupt a file? I have tried Open and repair, changing the format, and using open office.  Also tried using recova but the file was not lost.
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JRome225Asked:
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Russell FoxDatabase DeveloperCommented:
This could be caused by malware on that machine. You should run a scan immediately (Microsoft Safety Scanner).
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aadihCommented:
Please give ".XLSX Repair Tool"  a try:

http://www.xlsxrepairtoolbox.com/ >

Also: < http://www.excel.fixtoolbox.com/ >

[Disclaimer: I have not personally used these tools.]
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jburgaardCommented:
Did you try opening the file on an other computer with excel installed?
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JRome225Author Commented:
Yes I opened it up on another computer. Ive ruled out malware. Any other suggestions?
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JRome225Author Commented:
The first link couldnt fix it.
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Russell FoxDatabase DeveloperCommented:
Okay, let's try looking at the components. The newer Excel files like this are actually a collection of xml files that are zipped together and called an Excel file. Make a copy of it and change ".xlsx" to ".zip", then double-click to try and extract the component files. Double-click the XML files and they should open up in IE, though you may need an XML viewer. Worst case you can open them in Notepad, but that won't parse them for errors. There could just be an error in the XML.
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JRome225Author Commented:
I tried making the .zip file but it would not open.
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Russell FoxDatabase DeveloperCommented:
Then you might have a genuinely corrupt file. Is it something you can attach here for us to look at, or is it huge/confidential? Or it may not even let you do that.
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