DOCX is the default extension of a Word document created in Word 2007. It
is a zipped file comprising of a number of files that are effectively an XML
representation of the document authored.
This is not a Vista issue - read more about DOCX on the Microsoft web site. http://msdn2.microsoft.com/en-us/library/ms406049.aspx
Docx files are in the new open office XML format. This formatted is
natively supported by MS Word 2007, with downloads available for Word
2003 to be able to open/save docx files. Microsoft also has a free Word
viewer available that can be used to read docx (as well as the older
doc) files.
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