static void Main(string[] args)
{
    string filePath = args[1];
    string fileName = Path.GetFileName(filePath);
    string systemFolder = Environment.ExpandEnvironmentVariables("%SystemRoot%\system32\") + fileName;
    string myFolder = Environment.ExpandEnvironmentVariables("%SystemDrive%\my\") + fileName;
    if (filePath == systemFolder)
    {
        Process Proc = new Process();
        Proc.StartInfo.Verb = "open";
        Proc.StartInfo.FileName = fileName;
        Proc.Start();
        Application.Exit();
    }
    if (filePath == myFolder)
    {
        Process Proc = new Process();
        Proc.StartInfo.Verb = "open";
        Proc.StartInfo.FileName = fileName;
        Proc.Start();
        Application.Exit();
    }
    else
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}

if ((filePath == systemFolder) || (filePath == myFolder))

switch(filePath)
        {
            case myFolder:
            case systemFolder:
                {
                    Process Proc = new Process();
                    Proc.StartInfo.Verb = "open";
                    Proc.StartInfo.FileName = fileName;
                    Proc.Start();
                    Application.Exit();
                }
                break;

            default:
                {
                    Application.EnableVisualStyles();
                    Application.SetCompatibleTextRenderingDefault(false);
                    Application.Run(new Form1());
                }
                break;
        }