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

MIF
       Module Interconnection Facility (Proteus)


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

Maker Interchange Format
MIF

   (MIF) A language used to describe a FrameMaker document in a
   text file.  MIF is used to exchange information between
   FrameMaker and other applications.

   ["Using FrameMaker 4," Windows and Macintosh Version,
   c. 1986-1993 Frame Technology Corporation].

   (1995-01-30)