I'm of the opinion that burning caused by innate abilities, such as Red Dragon Breath, should count as Fire damage and bypass Magic Resistance, since it was not caused by a spell and is therefore not magical in nature. Hot stuff created by spells, however, such as Fireball, Sunfire and Fire Storm, should count as Magic Fire, and can be blocked by Magic Resistance.
Of course, that's just my theory, but since it makes some logical sense it's probably not the way it actually works in the game.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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