Yes, you need to install this tool separately. You can obtain it here:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=21138If that does not take you directly to the Microsoft download page for this tool, search for "html help workshop" at
http://www.microsoft.comNo additional configuration is necessary beyond installation as it registers itself with Windows in such a way that allows XMetaL to automatically find it.