code: public static Map<String, File> loadStringToFileMap(final CharSource source) throws IOException {
      return loadMap(source, Functions.<String>identity(), FileFunction.INSTANCE,
          IsCommentLine.INSTANCE);
    }
docs: Reads a {@link Map} from a {@link CharSource}, where each line is a key, a tab character
  ("\t"), and a value. Blank lines and lines beginning with "#" are ignored.