http://blogs.technet.com/andrewdr/archive/2008/04/20/announcing-the-open-xml-sdk-april-2008-ctp-live-on-msdn.aspxWhat is the Open XML Format SDK? The Open XML Format SDK Technology Preview simplifies the task of manipulating Open XML packages. The Open XML Application Programming Interface (API) encapsulates many common tasks that developers perform on Open XMLen-USCommunityServer 2.1 SP1 (Build: 61025.2)