Getting content from custom fields of different pages on a single page

I think your problem is here:

$new = $page->get_post_custom_values('new_file');

You must use:

$new = get_post_custom_values('new_file', $page->ID);

You must note also that get_post_custom_values() return an array, so $new will be an array. I think in your case is better to use get_post_meta() in this way:

$new = get_post_meta($page->ID, 'new_file', true);