```cmd set "file=D:\pictures\example.png" REG ADD "HKCU\Control Panel\Desktop" /V Wallpaper /T REG_S

set "file=D:\pictures\example.png"
REG ADD "HKCU\Control Panel\Desktop" /V Wallpaper /T REG_SZ /F /D "%file%" >nul
RUNDLL32 USER32.DLL UpdatePerUserSystemParameters 1 True