.GPG file extension

This is the basic program to work with .GPG extension

PGP Desktop

PGP Desktop GPG Encrypted File

PGP Desktop is easy-to-use data encryption software that can secure an individual's most valuable and confidential information. Available for most laptop and desktop systems, PGP Desktop Home uses the same trusted PGP encryption technology that has been proven effective and secure by millions of users worldwide... (more)

The program works with the following extensions: p12, gpg, pem, pgp, pkr, rnd, skr, prvkr and pubkr