PGC

The pgc file extension is mainly related to Portable Game Notation format.

PGN is  a standard designed for the representation of chess game data using ASCII text files. PGN is structured for easy reading and writing by human users and for easy parsing and generation by computer programs. The intent of the definition and propagation of PGN is to facilitate the sharing of public domain chess game data among chessplayers (both organic and otherwise), publishers, and computer chess researchers throughout the world.

PGN is not intended to be a general purpose standard that is suitable for every possible use; no such standard could fill all conceivable requirements. Instead, PGN is proposed as a universal portable representation for data interchange. The idea is to allow the construction of a family of chess applications that can quickly and easily process chess game data using PGN for import and export among themselves.

The pgc file extension is also used for some older bitmap format used by Atari Portfolio a IBM PC-compatible palmtop computer, and was released by Atari Corporation in 1989.

The pgc file contains compressed image (240x64).