Wordpress | Create Virtual File in Wordpress Plugin

wordopress-create-virtual-file-in-plugin.php

<?php
//assumes you have a locations.php file in your plugin folder
function advnap_kml() {
    $url = str_replace( trailingslashit( site_url() ), '', plugins_url( '/locations.php', __FILE__ ) );
    add_rewrite_rule( 'locations\\.kml$', $url, 'top' );
}
add_action( 'wp_loaded', 'advnap_kml' );

function advnap_plugin_activate() {
     flush_rewrite_rules();
}
register_activation_hook( __FILE__, 'advnap_plugin_activate' );
//http://wordpress.stackexchange.com/questions/9870/how-do-you-create-a-virtual-page-in-wordpress
?>