About .mkv files

Nancy Shackelford

I have this video set called "Melody Ranch." All files are either just .jpg files, or this one .mkv file. It'll play on VLC, but not Winamp. I don't care so much about that, but I'd like to extract the audio from it for a friend of mine. Is this possible? If so, what do I use for that?
Thanks in advance,

Nancy Shackelford --Walk On Faith And Trust In Love - Michael Reid--

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