SB Android fix 1: new code

			$user_agent = strtolower($_SERVER['HTTP_USER_AGENT']);
			$download_file_name = $file_name;
			if (stripos($user_agent, 'android') !== false) {
				$file_name_array = explode('.', $file_name);
				$last_key = count($file_name_array) - 1;
				$file_name_array[$last_key] = strtoupper($file_name_array[$last_key]);
				$download_file_name = implode('.', $file_name_array);
			}
			header('Content-Disposition: attachment; filename="'.$download_file_name.'"');