I know that creating the XML for the Windows 8 Company Store that uses the Desktop client is not easy. That's why I've created this new tool to help you.
Using this tool you will be able to generate the XML code to insert into your StoreStructure.xml file easily.
On the left pane you can choose an application package from your installed package list. Click on the arrow to load application details for edition. Write a name, a description, choose the Application from the application package (for example, the communication built-in package contains 4 applications), etc. When you're done, click on the second arrow to build the corresponding XML.
And finally, click on the “copy to clipboard” button, then paste the XML on your StoreStructure.xml.