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In 2006 Microsoft announced that file formats for Office 2008 (Macintosh) and Office 2007 (Windows) will now have four characters
in their extensions rather than the traditional three. This new naming convention stems from the xml technology being used
by the software.
Word = .docx
Excel = .xlsx
PowerPoint = .pptx
The new software offers backwards compatibility to older versions and another new feature allows the user to save documents as PDF.
For more
information on the Open XML format, go to http://office.microsoft.com/en-us/help/HA100069351033.aspx
Microsoft's change in file formats prevents older versions of Office from opening files with the new .docx, .xlsx, or .pptx extensions.. The
Office of Information Technology (OIT) Help Desk
has documented this issue and offers instruction on converting Microsoft documents.
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