OpenXML Package Explorer utility provides the ability to open an Open XML package and browse through the relationships and parts. It supports navigation of embedded sub-packages and uses an object model that provides a clean separation between the UI and the packaging model. You can use this utility to learn about Open XML, by browsing through documents to see their logical structure. It is provided with full source code, so you can also use it as a starting point for other types of Open XML projects.

The first release of Package Explorer as found on OpenXmlDeveloper.org. Browse packages and subpackages using specialized viewer classes. Future releases of this project will possibly include the ability to create and edit packages, direct support for various types of packages (a WordPackage for instance) and corresponding actions such as ‘Clean Word Document’. A new WPF front-end is also being considered. If you have ideas for how to enhance or extend this utility, check the project's page and help making this utility better.