This template is recommended for narrative documents in projects using the Sandcastle plugin, because it contains a toolbar "Doc-To-Help - Sandcastle" with a button for each special "Link ..." style for creating links from narrative parts to the reference (styles such as Link Class, Link Property, etc). You can use your own template if you add the "Link ..." styles to it (or if you don't need those styles), but this template has these styles already defined for you with a handy toolbar that makes applying these styles a matter of a single click.