Vb.net Exporting Richtextbox formated content to Excel Cell

Vb.net Exporting Richtextbox formated content to Excel Cell

Further to my first question regarding that issue, here are my progress:
First : using the function: sheet.Cells(X, X).Value = RichTextBox1.Rtf, I
find this kind of cell content:
"rtf1\ansi\ansicpg1252\deff0\deflang1036\deflangfe1036{\fonttbl{\f0\fswiss\fprq2\fcharset0
Calibri;}{\f1\fnil\fcharset0 Calibri;}{\f2\froman\fprq2\fcharset0 Times
New Roman;}} {\colortbl ;\red255\green0\blue0;\red0\green0\blue139;}
\viewkind4\uc1\pard\f0\fs22 XXXXXXXXXXX\par \cf1\strike\f1
XXXXXXXXXXX\par"
I can however manually use the excel function "keep the original
formatting" to paste some rtf doc content into a cell.
Could you help me find a way to use this function in the VB.net code if
possible?
Thanks.