As you all know, the new Office formats use ZIP containers to wrap up all the XML parts that make up a document. We chose to use ZIP and XML because of the wide spread use and openness. While you can use any ZIP library to crack open the files, we are also providing an assembly to make working with the files even easier. Kevin Boske just recently started blogging and he plans to spend some time giving folks a closer look into the System.IO.Packaging functionality. It's a great way to quickly crack into the ZIP containers and navigate the various parts that make up the files. In his post today, Kevin shows how you can navigate to a specific part within the container.