The PGP file extension is used to refer to PGP – pretty good privacy – security files. PGP security files can be accessed and edited with the appropriate software but are designed for security and should only be changed by the user.
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.