When you try downloading one of the Office 2007 file types such as .DOCX, .PPTX, .XLSX, the file may download as a .Zip (Compressed Folder). This happens if the Office 2007 file format MIME types are not registered in the Web server you’re downloading the file from.

There is nothing much the user can do, apart from saving / renaming the file with the correct extension and then opening it using Office 2007.

If you had already downloaded the file (as .zip), simply rename (change) the extension accordingly. To do that, you’ll have to clear the Hide extensions for known file types check box in Folder Options. (REF Show or hide file name extensions)
Note to Webmasters
If you’re a Webmaster and want to register Office 2007 Open XML File Formats in your server, visit these links for detailed information:
Office Resource Kit Blog : Register Office 2007 file format MIME types on servers (Windows / IIS)
Serving Office 2007 documents from a Linux PLESK web site (non-Windows)
Related Posts
- Add Word 97-2003 to the New Menu After Installing Office 2007
- Create PDF Files From Office 2007 Programs Using Microsoft Save as PDF or XPS Add-In
- Configure Office 2007 Applications to Save Files in 97-2003 Format by Default
- Add “Export to Microsoft Excel” To the Right-Click Menu in Internet Explorer
- Free E-Book First Look: Microsoft Office 2010 From Microsoft Press
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@John: If you need a sample URL, look at screenshot #1.
Wow! I’ve never seen this issue anywere! Still, you are right: Office 2007 file format is in fact a special ZIP file.
But can you please introduce an example of such misconfigured web site?