2098 NCH Dictation Audio File Audio DCT is a proprietary audio file format developed by NCH Software for their dictation software. As well as audio data, .dct files also contain dictation header information and can be encrypted. 220 The Church of Jesus Christ of Latter-Day Saints / The Church of Jesus Christ of Latter-Day Saints 18 Jan 2020 18 Jan 2020 fmt/1280 PUID dct File extension 1656 NCH Dictation Audio File Format consists of header, then RIFF WAVE audio data, which can be PCM or MP3. The audio data may also be encrypted, in which case the RIFF chunk is not visible, but a flag is set. The file may also include a transcription file, again for which a flag is set. 1 Absolute from BOF 0 1024 003200000000(01|52494646) Has lower priority than 737 WordPerfect for MS-DOS/Windows Document Has priority over 687 MPEG 1/2 Audio Layer 3