$setwallpapersrc = @"
using System.Runtime.InteropServices;
public class Wallpaper
{
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)
{
SystemParametersInfo(SetDesktopWallpaper, 0, path, UpdateIniFile | SendWinIniChange);
}
}
"@
Add-Type -TypeDefinition $setwallpapersrc
[Wallpaper]::SetWallpaper("C:\wallpaper.png")