// Save the following RTF file to the same folder as your .exe file, and call it "test.rtf".
    /*
    {\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0 Arial;}{\f1\fnil\fprq1\fcharset0 Courier New;}{\f2\fswiss\fprq2\fcharset0 Arial;}}
{\colortbl ;\red0\green128\blue0;\red0\green0\blue0;}
{\*\generator Msftedit 5.41.21.2508;}\viewkind4\uc1\pard\f0\fs20 This is the \i Greek \i0 word "psyche": \cf1\f1\u968?\u965?\u967?\u942?\cf2\f2 . It is encoded in Unicode.\par
Here are four extended \b ASCII \b0 characters (Windows code page 1252):  \'e2\'e4\u1233?\'e5\cf0\par
}
*/
class ConvertFromRTF
    {
static void Main()
        {

string path = @"test2.rtf";

//Create the RichTextBox. (Requires a reference to System.Windows.Forms.dll.)
            System.Windows.Forms.RichTextBox rtBox = new System.Windows.Forms.RichTextBox();

// Get the contents of the RTF file. Note that when it is
// stored in the string, it is encoded as UTF-16.
            string s = System.IO.File.ReadAllText(path);

// Display the RTF text.
            System.Windows.Forms.MessageBox.Show(s);

// Convert the RTF to plain text.
            rtBox.Rtf = s;
string plainText = rtBox.Text;

// Display plain text output in MessageBox because console
// cannot display Greek letters.
            System.Windows.Forms.MessageBox.Show(plainText);

// Output plain text to file, encoded as UTF-8.
            System.IO.File.WriteAllText(@"output.txt", plainText);
        }
    }