bp_media_download_file( $attachment_id,  $type = 'media' )

function bp_media_download_file( $attachment_id, $type = 'media' ) {

	// Add action to prevent issues in IE.
	add_action( 'nocache_headers', 'bp_media_ie_nocache_headers_fix' );

	if ( 'media' === $type ) {

		$the_file = wp_get_attachment_url( $attachment_id );

		if ( ! $the_file ) {
			return;
		}

		// clean the file url.
		$file_url = stripslashes( trim( $the_file ) );

		// get filename.
		$file_name = basename( $the_file );

		bp_media_download_file_force( $the_file, $file_name );
	}

}