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Corrupt excel .XLSX file

Hey guys,
i have a couple of excel .XLSX files that i have been trying to open but i haven't had any luck with then excel says "excel cannot open 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"
i have download the compatibility pack for office 2007 and tried to repair and extract the data from the file using the excel programs but i get a message that says the file is corrupt and cannot extract or repair the file.
i have tried this on all the files and selected every option i can in the repair menu, but i haven't had any luck with it.
is there a way to repair the file or am i going to loose the data stored in these files

Any and all help will be greatly appreciated
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