Repairing or recovering corrupted hour

I've just had the first casualty from my freezing MBP 7: a corrupted un-openable xlsx file.
I was working on several files at one time tonight, that the re-installation of the OS had finally solved my problem of freezing mac when it happened again.
Of all the files that were open at that time, the xlsx was damaged. after a hard restart, the restored version of the file popped up after clicking the app icon. I saved the restored file and closed it.
When i tried opening it, I couldnt do so anymore. ive tried saving it on different extensions, but i remained unsuccessful.
Please help me.

Since xlsx files are Excel files, I suggest you post your question on Microsoft's own forums for Excel, as this issue is not related to a compatibility problem between Mac OS and Windows.
http://www.officeformac.com/productforums/

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    any advice on how to recover my files?

    Here are the simple steps to repair data file in QuickBooks.
    Step 1: Close the software as soon as you receive damaged data file error message.
    Step 2: Now open the software. It will make a new Qbwin.log file.
    Step 3: Click on the ‘Window’ option and then from the drop-down menu, click on ‘Close All’. Now go the ‘File’ option then from the drop-down menu, click on ‘Utilities’. A menu will appear.
    Step 4: From that list select ‘Verify Data’. If QuickBooks reports that there is no issue it means your data is alright. On the other side, if you get a message saying “Your data has lost integrity” or “A data problem prevents QuickBooks from continuing” it
    means your data is corrupted or has a structural issue. And in this case, you will have to run the Rebuild Data tool.
    Step 5: Click on ‘Windows’ and select ‘Close All’ in order to close all the QuickBooks windows.
    Step 6: To launch the Rebuild Data tool, click on ‘File’ and select ‘Utilities’. Now from the drop-down menu, go to ‘Rebuild Data’ option.
    Step 7: Click on ‘OK’ and a pop-up will come warning you to take a backup of your file. It is recommended to create an entirely new backup file and don’t overwrite the existing file. To prevent overwriting, give a new name to the file when prompted.
    Click 8: Wait for some time and let the Rebuild Data Utility finish the process. When completed, click on ‘OK’.
    Step 9: Close the company file. Reopen the file to refresh the list.
    Step 10: Select the company file and now to launch the file, click on ‘Open’.
    Step 11: In order to verify if the data file is clean and is repaired, again run the Verify Data utility.
    Content From- http://supportforquickbooks.iyogi.com/troubleshooting/repair-quickbooks-data-file.html

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