Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
using System.Management;

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

        public static string GetCommandLine(Process process)
        {
            using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT CommandLine FROM Win32_Process WHERE ProcessId = " + process.Id))
            using (ManagementObjectCollection objects = searcher.Get())
            {
                return objects.Cast<ManagementBaseObject>().SingleOrDefault()?["CommandLine"]?.ToString();
            }

        }
    }
}