Creating an archive page templaet for use with custom post type

I was wondering if someone could help me through the code needed to create a page template that would display posts from a custom post type.

Here is the code I am working with:

<?php /* Template Name: Custom Post Type Archive */
get_header(); ?>

<?php
global $query_string;
query_posts($query_string . "post_type=MY_CPT&post_status=publish&posts_per_page=10");
if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

<h2><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
<?php the_excerpt(); ?>

<?php endwhile;
endif; ?>
<div class="navigation">
	<div class="alignleft"><?php next_posts_link('Previous entries') ?></div>
	<div class="alignright"><?php previous_posts_link('Next entries') ?></div>
</div>
<?php wp_reset_query(); ?>

<?php get_sidebar(); ?>
<?php get_footer();?>

I have named the file: archive-MY_CPT.php. I selected this template on the page I want it to display, and when I go to the page there are no posts displaying. What is the problem?