How do I redirect page in MVC3?

Question

I have created and host nvc3 web app now problem is when I open my

www.abc.com

it is opening index.cshtml i.e home page of mvc web app

but I dont want that to be open when I open

www.abc.com

I have one static page called

index.htm

should be open first

in mvc3 Global.asax code:

  public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );

        }

How can I render to

http://www.abc.com/mypage.html