Help: The 'SaveToFile' method for RichEdits

Hello,

        I'm using the SaveToFile method to save the text
in a Rich Edit:

       MainForm.HTMLSource.Lines.SaveToFile(MainForm.SaveHTML.FileName);

        The only thing is, I've just noticed that this
saves other information besides text - RTF, perhaps? I
really need the text saved as plain ascii. Is there a
simple way of doing this with SaveToFile, or will I need
to write a separate routine.

        Thanks,
                Blake