Help editing a batch script?

I have this batch script to change a desktop wallpaper, but it doesnt put it as a fullscreen wallpaper

@echo off
call :quiet>nul 2>&1
goto :EOF
:quiet
:: Configure Wallpaper
REG ADD “HKCU\Control Panel\Desktop” /V Wallpaper /T REG_SZ /F /D ”%SystemRoot%\bluescreen.bmp”
REG ADD “HKCU\Control Panel\Desktop” /V WallpaperStyle /T REG_SZ /F /D 0
REG ADD “HKCU\Control Panel\Desktop” /V TileWallpaper /T REG_SZ /F /D 0
:: Make the changes effective immediately
%SystemRoot%\System32\RUNDLL32.EXE user32.dll, UpdatePerUserSystemParameters

I’ve tried changing tile to stretch but it doesnt work. What do I need to do?