What is a b&w file and how do I open a b&w file?

An Atari bitmap image file is used as digital image data for some Atari arcade games. The digital graphics stored in an Atari bitmap image file is integrated with digital image compression specifications that were used in older bitmap graphics. These Atari bitmap image files are also embedded with binary formatting specifications and ANSI formatting standards that can allow other program files of an associated Atari arcade game to use the digital bitmap image data stored in an Atari bitmap image file which corresponds to certain graphical objects and elements integrated into the Atari arcade game. These Atari bitmap image files are also used by some old applications and digital video games that were developed for earlier Mac operating system versions. The content of an Atari image file is stored in the B&W file format, and these B&W files are affixed with the .b&w extension.