V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

AIFF
       Audio Interchange File Format


The Free On-line Dictionary of Computing (30 December 2018):

Audio IFF
AIFF

    (AIFF) A format developed by Apple
   Computer Inc. for storing high-quality digital audio and
   musical instrument information.  It is also used by SGI and
   several professional audio packages.

   (1994-10-10)