Why would he want to use modrewrite when all he wants is to redirect?
Make a .htaccess file and place it in the root folder of your site (the main folder where your index page is). The redirect code you need in the htaccess file is
for a little more info goto
http://www.carbonize.co.uk/Webdesign/htaccess.php
BUT when alls said and done the index page will be served to the visitors regardless of it's extension. So long as you only have a single index page the server will send that to the visitors browser.