Well all you would have to do is put the *.cab files in a i386 folder, example "%wpipath%\Install\i386" (this stops it from asking where the files are) and use a command to launch the [DefaultInstall] section of the addons *.inf like this: rundll32 advpack.dll,LaunchINFSection "%wpipath%\Install\InfFileNameHere.inf",,1 The ",,1" hides the CopyFiles progress bar making it fully silent