问mspaint的URL协议传递了错误的参数

EN

namespace ProtocolHandler
{
    class Program
    {
        const string NOARGSMESSAGE = "No args received";

        const string MESSAGEBOXCAPTION = "Paint Protocol Handler";
        const string APPLICATIONPATH = "mspaint";
        const string URLPROTOCOL = "mspaint:";
        const string ERRORMESSAGE = "An error occured when trying to open the file";

        static void Main(string[] args)
        {
            try
            {
                if (args.Length < 1)
                {
                    MessageBox.Show(NOARGSMESSAGE, MESSAGEBOXCAPTION);
                }
                else
                {
                    var filePath = GetFilePath(args);
                    Process.Start(APPLICATIONPATH, filePath);
                }
            }
            catch (Exception e)
            {
                MessageBox.Show(MESSAGEBOXCAPTION, $"{ERRORMESSAGE} \n {e.Message}", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private static string GetFilePath(string[] args)
        {
            return args[0].Replace(URLPROTOCOL, string.Empty);
        }
    }
}

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\mspaint]
@="Url:Paint Protocol Handler"
"URL Protocol"=""
"UseOriginalUrlEncoding"=dword:00000001

[HKEY_CLASSES_ROOT\mspaint\DefaultIcon]
@="C:\\Path\\To\\Paint Protocol Handler.exe,0"

[HKEY_CLASSES_ROOT\mspaint\shell]

[HKEY_CLASSES_ROOT\mspaint\shell\open]

[HKEY_CLASSES_ROOT\mspaint\shell\open\command]
@="C:\\Path\\To\\Paint Protocol Handler.exe %1"