WordPress snippet. Link images and documents to the file instead of the attachment page. This also changes the 'View' link in the Media Library admin screen. Add to a new plugin file or to the functions.php in your theme.

wp-attachment-links

// Link to attachments instead of attachment pages

function pmc_attachment_link( $link, $post_id ){
	return wp_get_attachment_url( $post_id );
}

add_filter( 'attachment_link', 'pmc_attachment_link', 10, 2 );