Just to clarify, since I get the impression people here don't fully "grok" it ... midi files are not sound recordings. MP3s, WAV files, etc. those all are digital formats for storing audio recordings ... but not MIDIs.
What MIDI files are is more like sheet music. They (essentially) say "the trumpet plays this note at this moment" ... but they leave it up the MIDI-playing program to decide exactly what that trumpet sounds like. They don't store the sound of a trumpet, which made midi files much smaller (and more attractive to devs) than actual audio recordings back then.
That's why there's differences between different sound cards and such: they all have different (virtual) "instruments".
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