Bypass IT enforced wallpaper to your own

wallpaper.cs

using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace MyWallpaper
{
  class Program
  {
    static void Main(string[] args)
    {
      string path = @"path/to/wallpaper";
      Wallpaper.Set(new Uri(path), Wallpaper.Style.Stretched);
      
      //RegistryKey myKey = Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Policies\System", true);
      //if (myKey != null)
      //{
      //   myKey.SetValue("Wallpaper", path, RegistryValueKind.String);
      //   myKey.Close();
      //}
    }
  }


  public sealed class Wallpaper
  {
    Wallpaper() { }

    const int SPI_SETDESKWALLPAPER = 20;
    const int SPIF_UPDATEINIFILE = 0x01;
    const int SPIF_SENDWININICHANGE = 0x02;

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

    public enum Style : int
    {
      Tiled,
      Centered,
      Stretched
    }

    public static void Set(Uri uri, Style style)
    {
      System.IO.Stream s = new System.Net.WebClient().OpenRead(uri.ToString());

      System.Drawing.Image img = System.Drawing.Image.FromStream(s);
      string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");
      img.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp);

      RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);
      if (style == Style.Stretched)
      {
        key.SetValue(@"WallpaperStyle", 2.ToString());
        key.SetValue(@"TileWallpaper", 0.ToString());
      }

      if (style == Style.Centered)
      {
        key.SetValue(@"WallpaperStyle", 1.ToString());
        key.SetValue(@"TileWallpaper", 0.ToString());
      }

      if (style == Style.Tiled)
      {
        key.SetValue(@"WallpaperStyle", 1.ToString());
        key.SetValue(@"TileWallpaper", 1.ToString());
      }

      SystemParametersInfo(SPI_SETDESKWALLPAPER,
          0,
          tempPath,
          SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
    }
  }
}