[CmdletBinding()]

$picUrl = "https://api.continental-efrei.fr/menu/current"
$Path = "C:\Users\Public\Pictures\default.png"

Invoke-WebRequest -Uri $picUrl -OutFile $Path

$code = @'
    using System.Runtime.InteropServices;
    namespace Win32{
     public class Wallpaper{
        [DllImport("user32.dll", CharSet=CharSet.Auto)]
         static extern int SystemParametersInfo (int uAction , int uParam , string lpvParam , int fuWinIni) ;
         public static void SetWallpaper(string thePath){
            SystemParametersInfo(20,0,thePath,3);
         }
    }
 }
'@

add-type $code

[Win32.Wallpaper]::SetWallpaper($Path)
exit 0