title: Corrupt Excel File
body: <p>I have a user who was working on an Excel 2007 file from a thumbdrive.. all of a suddem the file will not open and generates the following error:</p>
  
  <p>"Excel cannot open the file 'filename.xlsx' because 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. (OK)" </p>
  
  <p>I hit Ctrl-Shift-i to get the code for that error (101590)</p>
  
  <p>Any ideas how to repair? </p>
  
  <p>I have tried the following to no avail:</p>
  
  <ul>
  <li>Open and Repair tool </li>
  <li>Opening with OpenOffice</li>
  <li><a href="http://office.microsoft.com/en-us/excel-help/repairing-a-corrupted-workbook-HA010097017.aspx" rel="nofollow">http://office.microsoft.com/en-us/excel-help/repairing-a-corrupted-workbook-HA010097017.aspx</a></li>
  <li><a href="http://support.microsoft.com/kb/928979" rel="nofollow">http://support.microsoft.com/kb/928979</a></li>
  </ul>