Currently I'm having the following htaccess content:

<IfModule mod_rewrite.c>
  RewriteEngine on

  RewriteRule ^(.*).html$ $1.php
 </IfModule>

I want to change the php extension to html. Now if I browse for localhost/xx.html I get the right content. BUT I also can use xx.php or xx to access the oontent! I only want to get the content if there is an html extension! How can I make this work???

Example: On the server I have the file foo.php. Now I want the user to type in foo.html in the browser to get the content of foo.php. But if he types foo.php there will be an error.

I already tried this

RewriteRule ^(.*)[^\.html]$ error.php
RewriteRule ^(.*)\.html$ $1.php

But that does not really work

Thanks!