audio/wav

Uncompressed audio's default suitcase since 1991, and a naming mess to match its age: audio/wav, audio/x-wav, and audio/wave all circulate for the same files, and none of the three is IANA-registered — the registered name, audio/vnd.wave from RFC 2361, is the one nobody uses. Browsers accept all of them. WAV is a RIFF container, so the file opens with RIFF at offset 0, but the bytes that actually say WAV are the WAVE form type at offset 8 — and the codec field inside can be anything in Microsoft's registry, not just PCM.

.wav is universal; the mime-db aliases audio/x-wav and audio/wave map to the same extension.

Defined by RFC 2361. Registry facts from the IANA media-types registry via mime-db.