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Change windows desktop background for day and night, using batchfile

::==chwallpaper.bat
 
Echo %Time%
 
for /f "tokens=1-3 delims=:." %%a in (
"%time%") do set hours=%%a
 
set wallpaper=e:\etc\wallpaper_tag.bmp
if %hours% LSS 8 goto setnight
if %hours% GTR 20 goto setnight
goto setit
 
:setnight
set wallpaper=e:\etc\wallpaper_nacht.bmp
 
 
:setit
 
Echo Setting wallpaper to %wallpaper%
 
REG ADD "HKCU\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d %wallpaper% /f 
RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
 
:finish

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