http://blogs.msdn.com/b/brian_jones/archive/2006/07/20/672745.aspxThere are a number of great sources of information on the new Office Open XML formats out there. I like to think that this blog is one of those sources, but there is also the OpenXMLDeveloper.org community, and the Ecma TC45 site . Another great sourceen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)