static void windows_killProcesses(Collection<Int> pids) {
  assertWindows();
  if (empty(pids)) ret;
  LS pids2 = allToString(pids);
  S s = joinWithSpaces(addPrefixToAll("/PID ", pids2));
  print("Killing processes: " + s);
  print(backtick("taskkill " + s));
}