private void openFileWithLogToolStripMenuItem_Click(object sender, EventArgs e)
    {
      try
      {
        using (OpenFileDialog ofd = new OpenFileDialog())
        {
          FileTypeCollection<Map> ftc = FileTypeManagerCache.GetFileTypeCollection<Map>(FileTypeFlags.ReadSupport);
          ofd.Filter = ftc.GetFileTypesFilter();

          if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
          {
            using (FileStream input = File.OpenRead(ofd.FileName))
            {
              Map map = null;

              ZipPackage zipPackage = (ZipPackage)ZipPackage.Open(input, FileMode.Open, FileAccess.Read);

              string mapStylesPath = Path.Combine("studio", "mapstyles.xml");
              Uri partUriMapStyles = PackUriHelper.CreatePartUri(new Uri(mapStylesPath, UriKind.Relative));

              PackagePart packagePartMapStyles = zipPackage.GetPart(partUriMapStyles);
              using (Stream packStream = packagePartMapStyles.GetStream(FileMode.Open, FileAccess.Read))
              {
                ObjectSerializer<Map> serializer = new ObjectSerializer<Map>();
                serializer.UnknownElement += serializer_UnknownElement;
                map = serializer.Deserialize(packStream);

/*
               // или закоментить три последние строчки и опробовать прямой вариант с XmlSerializer
               XmlSerializer serializer = new XmlSerializer(typeof(Map));
               map = (Map)serializer.Deserialize(packStream);
 */
              }
              MessageBox.Show("Map was loaded. Number of layers is " + map.Layers.Count.ToString());
              map.Dispose();
            }
          }
        }
      }
      catch(Exception ex)
      {
        MessageBox.Show(ex.StackTrace);
      }
    }

    void serializer_UnknownElement(object sender, SerializationEventArgs e)
    {
      if (e.UnknownElement != null)
        MessageBox.Show(e.UnknownElement.ToString());
    }