Check this
http://filext.com/file-extension/smf
.smf is a MIDI FILE. a (Musical Instrument Digital Interface) sequence or song. Any hardware or software program that will play a midi file, IE, a Keyboard sequencer, or software music program (like this program below). It can be transferred from a computer with a usb, and/or a midi cable to a hardware sequencer, ie drum machine, keyboard work station.
http://createdigitalmusic.com/2006/07/17/free-windows-sequencershosts-for-music-straight-out-of-no-cash-2/
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