GarageBand exports exactly one file format — the Audio Interchange File Format (with extensions of aif, aiff, AIF, or AIFF). Fortunately, AIF files are the gold standard of audio files, the highest-of-high-quality uncompressed audio that you can save on a disc. AIF files sound great, but a cost is incurred: The files are huge — too big to send via e-mail or download or to stream from the Interne..