"FAP" is a file extension used by Ensoniq PARIS systems to denote audio files saved in the PARIS Audio File (PAF) format. FAP files contain uncompressed audio data and can be opened and edited using the Ensoniq PARIS software.
Ensoniq PARIS uses a proprietary audio format called "PARIS Audio File" or PAF. PAF files contain uncompressed audio data and are typically used for high-quality audio recording and mixing applications. The Ensoniq PARIS system was popular in the late 1990s and early 2000s, but it is now discontinued.