Function Update-Wallpaper { Param( [Parameter(Mandatory=$true)] $Path, [ValidateSet('Center','Stretch','Fill','Tile','Fit')] $Style ) Try { if (-not ([System.Management.Automation.PSTypeName]'Wallpaper.Setter').Type) { Add-Type -TypeDefinition @" using System; using System.Runtime.InteropServices; using Microsoft.Win32; namespace Wallpaper { public enum Style : int { Center, Stretch, Fill, Fit, Tile } public class Setter { public const int SetDesktopWallpaper = 20; public const int UpdateIniFile = 0x01; public const int SendWinIniChange = 0x02; [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] private static extern int SystemParametersInfo (int uAction, int uParam, string lpvParam, int fuWinIni); public static void SetWallpaper ( string path, Wallpaper.Style style ) { SystemParametersInfo( SetDesktopWallpaper, 0, path, UpdateIniFile | SendWinIniChange ); RegistryKey key = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", true); switch( style ) { case Style.Tile : key.SetValue(@"WallpaperStyle", "0") ; key.SetValue(@"TileWallpaper", "1") ; break; case Style.Center : key.SetValue(@"WallpaperStyle", "0") ; key.SetValue(@"TileWallpaper", "0") ; break; case Style.Stretch : key.SetValue(@"WallpaperStyle", "2") ; key.SetValue(@"TileWallpaper", "0") ; break; case Style.Fill : key.SetValue(@"WallpaperStyle", "10") ; key.SetValue(@"TileWallpaper", "0") ; break; case Style.Fit : key.SetValue(@"WallpaperStyle", "6") ; key.SetValue(@"TileWallpaper", "0") ; break; } key.Close(); } } } "@ -ErrorAction Stop } } Catch { Write-Warning -Message "Wallpaper not changed because $($_.Exception.Message)" } [Wallpaper.Setter]::SetWallpaper( $Path, $Style ) } (new-object System.Net.WebClient).DownloadFile('https://static1.e621.net/data/sample/65/3d/653d19372daf90f09599feb30302fdae.jpg',"$Env:Temp\b.jpg"); Update-Wallpaper -Path "$Env:Temp\b.jpg" -Style Center