Question about Ms Word

Question

Hey Guys, I am trying to develop an application, where people can open and edit word documents and RichTextFiles. I am using RichTextBox for editing.., but I am unable to figure out how to open Word Documents. I figured I need to add some COM library by searching through some forums.. But I want to this program to function perfectly, no matter if the user has MS office installed on his computer or not.. The document should be opened in the textbox, not with the MS WORD application.. I hope you understand my problem..please help me thanks