I'm not sure if you can... I mean, a word doc can have more on it than just text such as pictures, shapes, and controls. If you wanted to convert a word document to rich text, you'd probably have to parse it and convert it yourself.
That said, can a word document save as rich text? Google says it can, so perhaps there's a way you can use it to save as a rich text format, then open that in your app?
http://www.c-sharpcorner.com/uploadf...romdotnet.aspx
There are ways to control word from C#, so perhaps that will provide you with some insights. Also, this method seems a bit cumbersome, hopefully someone else might have some ideas on how to achieve the result you're looking for with a less involved method ;)
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