Mozilla Browser control & Word Documents

Is it possible to open Microsoft word documents directly in the Mozilla Browser control
(http://www.iol.ie/~locka/mozilla/control.htm#download)?  This control has the same interfaces as the WebBrowser control from MS, but I can't get the control to open word Docs with the Navigate message.

Instead I get a prompt to select program and then it opens the doc in word.

All I have is a form with the control, AxBrMoz, and a button.

Here's the button code:

private void button2_Click(object sender, System.EventArgs e)
{
    System.Object nullObject = 0;
    String fName = "c:\\MyResume.doc";

    axBrMoz.Navigate(fName,ref nullObject,ref nullObject,ref nullObject,ref nullObject);
                  
}