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 static class Program
    {
        /// <summary>
        /// Der Haupteinstiegspunkt für die Anwendung.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            bool createdNew;
            Mutex m = new Mutex(true, "84749c3a-b35b-4480-b775-39c1b4e80f91", out createdNew);
            if (createdNew)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1(args));
                m.ReleaseMutex();
            }
            else
            {
                IpcChannel ipc = new IpcChannel("MusikPlayer");
                ChannelServices.RegisterChannel(ipc, false);

                ArgContainer ac=(ArgContainer)Activator.GetObject(typeof(ArgContainer), "ipc://MPlayer/ArgContainer");
                ac.OnAddArgs(args);
            }
        }
    }

    public class ArgContainer : MarshalByRefObject
    {

        public delegate void AddArgs(string[] files);

        public AddArgs OnAddArgs;

        public ArgContainer()
        {

        }
    }                    

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private void Form1_Load(object sender, EventArgs e)
        {
      //korrekte Serialisierung von Delegates ermöglichen
      BinaryServerFormatterSinkProvider serverProv = new BinaryServerFormatterSinkProvider();
      serverProv.TypeFilterLevel = System.Runtime.Serialization.Formatters.TypeFilterLevel.Full;

      BinaryClientFormatterSinkProvider clientProv = new BinaryClientFormatterSinkProvider();

      //Channel erstellen
      Dictionary<string, string> properties = new Dictionary<string, string>();
      properties["portName"] = "MPlayer";
      IpcChannel ipc = new IpcChannel(properties, clientProv, serverProv);

      //Channel registrieren
      ChannelServices.RegisterChannel(ipc, false);


      //"Vermittlungsobjekt" als Dienst registrieren. 
      RemotingConfiguration.RegisterWellKnownServiceType(typeof(ArgContainer),
          "ArgContainer",
          WellKnownObjectMode.Singleton);

      //Vermittlungsobjekt erstellen
      ArgContainer ac = (ArgContainer)Activator.GetObject(typeof(ArgContainer), "ipc://MPlayer/ArgContainer");

      //Delegat zuweisen
      ac.OnAddArgs += InvokeAddFiles;
        }

 public void InvokeAddFiles(string[] files)
        {
            this.Invoke(new ArgContainer.AddArgs(AddFiles), new object[] { files });
        }

 public void AddFiles(string[] files)
        {
                hinzufuegen(files[0]);//Ist es normal das files.Length immer 0 ist?
        }