It's a standard midi, and your native browser plugin would have no trouble with it. Quicktime works for me, too (I don't generally use it for midis as it can be rather intrusive); it doesn't play automatically, though. Real Player is sulking because I won't let it update itself with more junk that I don't want, so it won't play at present; in fact, I've forbidden it to open anything not in its own native formats because it needs to be kept firmly in its place! Windows Media Player and Winamp play the midi quite happily, as well. It's possible that the problem is at your end.