autop your XMLRPC posts

wpse44849.php

<?php
/*
Plugin Name: Autop XMLRPC Content
Description: A custom XMLRPC method that allows WordPresss to add autop to posts.
Author: Christopher Davis
Author URI: http://christopherdavis.me
License: GPL2
*/

add_filter( 'xmlrpc_methods', 'wpse44849_xmlrpc_methods' );
/**
 * Filters the XMLRPC method to include our own custom method
 */
function wpse44849_xmlrpc_methods( $method )
{
    $methods['post_autop'] = 'wpse44849_autop_callback';
    return $methods;
}

/**
 * Callback function for our custom XML RPC method. Stolen from the
 */
function wpse44849_autop_callback( $args )
{

    $post_ID     = absint( $args[0] );
    $username    = $args[1];
    $password    = $args[2];
    
    $user = wp_authenticate( $username, $password );

    // not a valid user name/password?  bail.
    if( ! $user || is_wp_error( $user ) )
    {
        return false;
    }
    
    $post = get_posts( array( 'p' => $post_ID ) );
    
    // no posts?  bail.
    if( empty( $post ) )
    {
        return false;
    }
    
    $post = $post[0];
    
    // the magic happens here
    $post->post_content = wpautop( $post->post_content );
    
    return (array) $post;
}

This is great, thanks!
Could you tell me how to make this take effect when I get the full site XML from: Tools -> Export -> All Content

Thanks,
-Eric