1779 Notation Interchange File Format Audio Notation Interchange File Format (NIFF) is a music notation file format used primarily for transferring music notation between different scorewriters. 1 Digital Preservation Department / The National Archives 26 Sep 2016 26 Sep 2016 application/vnd.music-niff MIME fmt/974 PUID nif File extension 1337 NIFF BOF: RIFX{4}NIFF C header file from format SDK: http://www.music-notation.info/niffsdk/niff.h 1 Absolute from BOF 0 0 52494658{4}4E494646