IE のウィンドウの列挙(C#)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;

namespace Hoge
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Shell32.ShellClass shell = new Shell32.ShellClass();
            SHDocVw.ShellWindows windows = (SHDocVw.ShellWindows)shell.Windows();
            foreach (SHDocVw.WebBrowser wb in windows)
            {
                Console.WriteLine("loc = " + wb.LocationURL);
            }
        }
    }
}

参照設定したものはつぎの2つ。
説明 / 名前 / パス
Microsoft Shell Controls And Automation / Interop.Shell32 / Interop.Shell32.dll
Microsoft Internet Controls / Interop.SHDocVw / Interop.SHDocVw.dll