Audio file used by games from older computer systems that had a General Instruments AY series sound chip; contains a "chiptune," which specifies a sound format that enables the sound card chip to create sounds in real time; can be played back using a program that emulates the AY sound chip.

AY files were commonly used by Amstrad CPC (Colour Personal Computer) games, which were developed in the 1980s. They were also used by Spectrum ZX games and Atari ST games.