How to Save as Word Document

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C#

I'm using a rich-text box in my Application. i need to save it as a Word Document.
How do i Do it .i Have already Add the Reference but it seems like it only save as a word document, but could not open in MS word
So guys please Help !!!
Thank you


Code:

try
           {
               string SaveFile = "";
               saveFileDialog1.Title = "Save File";
               saveFileDialog1.FileName = "";
               saveFileDialog1.Filter = "Word Document|*.docx";
               if (saveFileDialog1.ShowDialog() != DialogResult.Cancel)
               {
                   SaveFile = saveFileDialog1.FileName;
                   textArea.SaveFile(SaveFile, RichTextBoxStreamType.UnicodePlainText);
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show("I'm Sorry ! Something Went Wrong", "Error", MessageBoxButtons.RetryCancel,         MessageBoxIcon.Stop);
           }