One of the first problem when Win 7 was introduced it was about setting sound configuration to 5.1. By default, laptops have stereo output so, in my opinion, when installed Win 8 will set audio output to stereo. And that is in Window's control panel, audio output, speaker configuration. So, the decoding chain will be set to stereo before inputing to AC3Filter. If it's available in speaker configuration, the option 5.1 must be set.
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