public Collection<String> getExtractFiles(OperatingSystem os) {
    Collection<Library> libraries = getRelevantLibraries();
    Collection result = new ArrayList();

    for (Library library : libraries) {
      Map natives = library.getNatives();

      if ((natives != null) && (natives.containsKey(os))) {
        result.add("launcher/" + library.getArtifactPath((String)natives.get(os)));
      }
    }

    return result;
  }