@Override
    public void unpackPreGeneratedSkeletons(String skeletonDir) {
      ProgressManager.progress(PyBundle.message("python.sdk.unpacking.pre.generated.skeletons"));
      try {
        final VirtualFile jar = JarFileSystem.getInstance().getVirtualFileForJar(myArchiveRoot);
        if (jar != null) {
          ZipUtil.extract(new File(jar.getPath()),
                          new File(skeletonDir), null);
        }
      }
      catch (IOException e) {
        LOG.info("Error unpacking pre-generated skeletons", e);
      }
    }
@Override
    public void unpackPreGeneratedSkeletons(String skeletonDir)