Unable to open .msg format in the web browser - asp.net

Hi,
 
I am using below code to open .msg file in outlook instead of downloading it to client system.
 
Case "msg"
 
                    Response.Clear()
                    Response.ContentType = "application/vnd.ms-outlook"
                    Response.AddHeader("content-disposition", "inline; filename=" + filename)
                    Response.BinaryWrite(buffer)
                  ...