Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.VisualBasic.ApplicationServices;

namespace UWMConfigVersionSelector
{
    static class Program
    {
        /// <summary>
        /// Der Haupteinstiegspunkt für die Anwendung.
        /// </summary>
        [STAThread]
        static void Main()
        {
            //Application.EnableVisualStyles();
            //Application.SetCompatibleTextRenderingDefault(false);
            //Application.Run(new Form1());

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            string[] args = Environment.GetCommandLineArgs();
            SingleInstanceController controller = new SingleInstanceController();
            controller.Run(args);

        }
    }

    public class SingleInstanceController : WindowsFormsApplicationBase
    {
        public SingleInstanceController()
        {
            IsSingleInstance = true;

            StartupNextInstance += this_StartupNextInstance;
        }

        void this_StartupNextInstance(object sender, StartupNextInstanceEventArgs e)
        {
            Form1 form = MainForm as Form1; //My derived form type
            form.ConfigPath = e.CommandLine[1];
            form.GetAAMPProperties(form.ConfigPath);
        }

        protected override void OnCreateMainForm()
        {
            MainForm = new Form1();
        }
    }
}