For a second I thought file structure will not be shown in video, which would be difficult for newcomers to understand what's happening, but you did.
Open XML Package Editor plugin rocks :D
Is it possible to update/create links to Excel / PowerPoint ?
Has the last link moved ? Trying to access it gives just 404 Error.https://dev.office.com/docs/add-ins/develop/create-better-add-ins-for-word-with-office-open-xml