Program.cs

using ScreenShotTool.Forms;
using System.Runtime.Versioning;

namespace ScreenShotTool
{
    internal static class Program
    {
        [SupportedOSPlatform("windows")]
        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] commandLineArgs)
        {
            // To customize application configuration such as set high DPI settings or default font,
            // see https://aka.ms/applicationconfiguration.

            Application.SetHighDpiMode(HighDpiMode.PerMonitorV2); // set in app.manifest?
            ApplicationConfiguration.Initialize(); // this also sets the highdpimode, but the above line still seems to happen

            if (commandLineArgs.Length > 0)
            {
                if (commandLineArgs[0] == "-editor" || commandLineArgs[0] == "/editor")
                {
                    Application.Run(new ScreenshotEditor());
                }
                else
                {
                    Application.Run(new ScreenshotEditor(commandLineArgs[0]));
                }
            }
            else
            {
                Application.Run(new MainForm());
            }

        }
    }
}