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http://blogs.msdn.com/b/vsofficedeveloper/archive/2008/03/11/excel-2007-extension-warning.aspx

If your Excel exports are being rejected as 'corrupt' this is the behavior of a Microsoft security upgrade in newer versions of Office.

Go to File > Options

Options

Go to Trust center and Trust center settings (over the right window)

Settings

Now Select 'Protected View' from the left pane and uncheck the desired security settings.

This example is in Word 2010, you must manually uncheck the options from ‘Excel 2010, PowerPoint 2010, Outlook 2010, etc. respectively.