File used by AutoCAD, an engineering design and documentation CAD application; contains external command definitions, which allow users to run custom commands in AutoCAD; can be used for running external programs and Windows commands through the AutoCAD interface; also used for defining aliases, or shortcuts, for commands with verbose syntax.

PGP files are stored by default in a file named acad.pgp. They are stored in plain text and contain commands in the following format: command,[executable],flags[,[*]prompt[,return_code]] Each command specifies the command alias, an executable to run, process flags, display prompt options, and a return code when the command finishes.