static void nativeFileSystemBrowser(File dir) {
  if (isLinux())
    backtick("xdg-open " + bashQuote(dir));
  else if (isWindows())
    backtick(print("start \"\" " + winQuote(dir)));
  else if (isMac())
    nohup("open " + bashQuote(dir));
  else fail("File system browser implemented for your OS");
}