Program.cs

using System;
using System.Windows.Forms;
using Microsoft.VisualBasic;
using System.IO;
using System.Diagnostics;

public class Program {
    [STAThread]
    public static void Main() {
        string ipAddress = Interaction.InputBox(
            "Enter the IP address or URL of the legacy device:", 
            "LegacyWebBox Connection", 
            "192.168.1.254"
        );
        if (string.IsNullOrWhiteSpace(ipAddress)) return;

        if (!ipAddress.StartsWith("http://", StringComparison.OrdinalIgnoreCase) && 
            !ipAddress.StartsWith("https://", StringComparison.OrdinalIgnoreCase)) {
            ipAddress = "http://" + ipAddress;
        }

        string vbs = 
            "Dim shell\r\n" +
            "Set shell = CreateObject(\"WScript.Shell\")\r\n" +
            "shell.RegWrite \"HKCU\\Software\\Microsoft\\Internet Explorer\\Main\\FeatureControl\\FEATURE_BROWSER_EMULATION\\iexplore.exe\", 8888, \"REG_DWORD\"\r\n" +
            "shell.RegWrite \"HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Ext\\Settings\\{F5078F32-C551-11D3-89B9-0000F81FE221}\\Flags\", 0, \"REG_DWORD\"\r\n" +
            "Dim ie\r\n" +
            "Set ie = CreateObject(\"InternetExplorer.Application\")\r\n" +
            "ie.Navigate \"" + ipAddress + "\"\r\n" +
            "ie.Visible = True\r\n" +
            "ie.ToolBar = True\r\n" +
            "ie.MenuBar = False\r\n" +
            "ie.StatusBar = False\r\n" +
            "ie.Width = 1200\r\n" +
            "ie.Height = 800\r\n";

        string tmpPath = Path.Combine(Path.GetTempPath(), "legacywebbox_tmp.vbs");

        try {
            File.WriteAllText(tmpPath, vbs);

            ProcessStartInfo psi = new ProcessStartInfo();
            psi.FileName = "wscript.exe";
            psi.Arguments = "\"" + tmpPath + "\"";
            psi.UseShellExecute = false;

            Process p = Process.Start(psi);

            System.Threading.Thread.Sleep(2000);
            try { File.Delete(tmpPath); } catch { }

        } catch (Exception ex) {
            MessageBox.Show("Error: " + ex.Message, "LegacyWebBox",
                MessageBoxButtons.OK, MessageBoxIcon.Error);
            try { File.Delete(tmpPath); } catch { }
        }
    }
}