FileStream tempFile = File.Open(@"C:RTF.rtf", FileMode.Open);
tempFile.Position = 0;
rtbEx.LoadFile(tempFile, RichTextBoxStreamType.RichText);
tempFile.Close();

rtbEx.LoadFile(@"C:UsersWilbur OmaeDesktopRTF.rtf", RichTextBoxStreamType.RichText);

rtbEx.Rtf = RTF;

Clipboard.SetText(RichTextBox1.Rtf, TextDataFormat.Rtf);

RichTextBox1.Text= Clipboard.GetText()

public class SermonReader : Form
{
    public RichTextBoxEx rtbEx= new RichTextBoxEx();
    private string RTF = "";

    public SermonReader(string rtf)
    {
        RTF = rtf;

        Shown += new EventHandler(ehFormShown);
        FormBorderStyle = FormBorderStyle.None;
        TopLevel = false;

        Controls.Add(rtbEx);

        rtbEx.Dock = DockStyle.Fill;
    }
    private void ehFormShown(object sender, EventArgs e)
    {
        rtbEx.Rtf = RTF;
    }
}