DLL process that runs at the same time every day to check files

I would like to create a "DLL" process that starts every day at 6 PM and looks for new XML files in the folder path. But I do understand how to implement this.

The only way to use a "timer" that starts on the first day at 6 PM and has a 24 hour interval like this?

System.Timers.Timer _myTime = new System.Timers.Timer();



private bool SetTimer(double intervall)
        {
            try
            {
                _myTime.Interval = intervall;
                _myTime.Elapsed += _myTime_Elapsed;
                _myTime.Enabled = true;
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

    void _myTime_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
        try
        {
            //do something to search for new XML files and copy them to a new file or so....
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }