Topic on Talk:Call of Duty: World at War
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Something like start /wait CoDWaW-1.6-1.7-PatchSetup.exe /s /b"%cd%"&&msiexec /a "Call of Duty(R) - World at War(TM) 1.7 Patch.msi" /qn TARGETDIR="%cd%\Setup\"
might work. Also, it shouldn't prompt you now.