htaccess en servidores de 1&1

AddDefaultCharset utf-8

Options -MultiViews
RewriteEngine On
RewriteBase /holamundo/

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)$ $1.php

RewriteRule ^prueba.html modulos/prueba.php

ErrorDocument 404 /index.php