how about
Extern "win32" Function SystemParametersInfo(uiAction, uiParam, pvParam Var, fWinIni) = "SystemParametersInfoA@16" Function SystemParametersInfo2(uiAction, uiParam, pvParam$z, fWinIni) = "SystemParametersInfoA@16" End Extern Function SetWallpaper(File:String) SystemParametersInfo2(20, 0, file, 1) End Function Local file:String = "C:\Windows\web\wallpaper\bliss.bmp" SetWallpaper(file)