FAQ/XLS-Exports-Error-when-opened-in-Excel.md
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+##Error:
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+'[filename]', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?" [Yes | No | Help]
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+
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+##Solution
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+There is no way to avoid this using our current HTML- Office export process:
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+
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+http://blogs.msdn.com/b/vsofficedeveloper/archive/2008/03/11/excel-2007-extension-warning.aspx
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+
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+This is an inherent part of Office security starting with Office 2007 when opening internet generated (HTML) files.
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+
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+The solution is to train your users to say 'Yes' to these particular files - because they specifically choose to open that file.
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+
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+You can also have disable this security feature in Office (2010 example):
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+[[Disable Protected Mode|/FAQ/disable-protected-mode-office-2010]]
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+