Mule CMS checks a user's query to the page and if there is such a page in the content folder - displays it. Otherwise, shows HTTP 404 error.
It means if the user enters 'http://site.com/download' then Mule CMS engine will look for '/content/download.php' file.
And if he is interested in 'http://site.com/help/page1.htm' then to view this page should be a file '/content/help/page1.htm.php'.
Thus, the HTML site with the following structure:
/index.htm
/download/index.htm
/order/index.htm
/support/index.htm
/help/index.htm
/help/page1.htm
/help/page2.htm
/help/page3.htm
...should be next for Mule CMS:
/content/index.php
/content/download.php
/content/order.php
/content/support.php
/content/help.php
/content/help/page1.htm.php
/content/help/page2.htm.php
/content/help/page3.htm.php