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Only then did I open a similarly .mkv converted version of the .sfd file, and inserted the .aac audio file into it, giving you this final version. I decided to include all the original files ...

Oddly the .sfd file behaved differently than normal. Usually I can split it via SFD to MPG Converter and obtain the audio file that way, but this time using that didn't give me the audio file, it was ...