public static String getFilenameExtension(String path) {
		if (path == null) {
			return null;
		}
		int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
		if (extIndex == -1) {
			return null;
		}
		int folderIndex = path.lastIndexOf(FOLDER_SEPARATOR);
		if (folderIndex > extIndex) {
			return null;
		}
		return path.substring(extIndex + 1);
	}