You just unlocked a memory for me. One of my dad's friends had a super cool keyboard, I think it was a Casio. It had midi, and a bunch of built in instruments. Then he had another friend, who was a huge geek, who figured out how to extract the midi instruments from the keyboard, so we could use them to replace the cheaper sounding midi instruments in windows.

Obviously it didn't sound as good as the keyboard, because it still was dragged behind by inferior hardware on the PC. Not to mention the fact that some of the instruments just didn't play, and that Windows liked to crash and revert all instruments back to the default if it didn't like an instrument we tried to feed it, but I still remember it as something really badass.