It should be possible as long as it's a supported file type, but you've raised a good question.

At the bottom of the object effects rack, you will find a Karaoke button.  With it you "should" be able to remove most, if not all, of the vocals from a given object.

I say "should" for two reasons.  If and when it does work, it does so with varying degrees of success.  There are often reminants and artifacts left behind depending on the make-up of the vocals.
Also, the karaoke feature will drastically alter the frequency balance of what's left.

The other reason is because, for some of us, the karaoke feature in MM-15 doesn't work at all.  Luckily for me, I still have MM-10, and it DOES work in that one.