function get_current_post_type() {
		global $post, $typenow, $current_screen;

		if ( $post && $post->post_type )
			return $post->post_type;

		elseif( $typenow )
			return $typenow;

		elseif( $current_screen && $current_screen->post_type )
			return $current_screen->post_type;

		elseif( isset( $_REQUEST['post_type'] ) )
			return sanitize_key( $_REQUEST['post_type'] );

		return null;
	}

	function custom_post_type_upload_directory( $args ) {

		if( 'rsg_download' == get_current_post_type() ) {
			$mydir 			= '/rsg-uploads';
			$args['path'] 	= $args['basedir'] . $mydir;
			$args['url']  	= $args['baseurl'] . $mydir;
		}

		return $args;
	}

	add_filter( 'upload_dir', 'custom_post_type_upload_directory' );