A26 filename extensions was developed for Atari 2600 video game console. Atari 2600 was produced for 15 years, form 1977 to 1992. A26 files store ROMs used by Atari 2600.

In order to run a A26 game on a modern computer, a Z26 emulator needs to be installed. Since 1997, the program is available for Windows, Mac OS X , and Linux systems. Z26 was developed by John Saeger and his colleagues. Z26 is distributed under the OpenGL open source license.