If you ever run across the need to rewrite a webpage URL from one extension to another (.html to .php for example), you can use the following .htaccess code.
# Only add the following 3 lines if they don't already exist
Options +FollowSymLinks -MultiViews
RewriteEngine On
RewriteBase /
# Rewrite the page extension from .html to .php
RewriteRule ^(.*)\.html$ $1.php [R=301,NC]This type of rewrite is generally only needed if your original file was static content and you decide to begin using dynamic content. In that case, you would need to create new file (.php, .aspx, etc) that allows for a server-side coding language.
Additional resources:
How to create a 301 redirect with .htaccess and Apache
