Unless the file is divided into only vocal and the rest of it channels (rare but it happens) there's not much to extract from the file. I suggest trying some vocal-muting software. I used to play with this kind of things long time ago. There was a program Goldwave which had this filter to mute vocals. I remember that it worked surprisingly good sometimes, it depends on what the vocal is like. Some songs could be nearly flawlessly extracted with this software, but some totally don't. If you really need it you should try.
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