I am looking for a standalone executable that facilitates PGP encryption of files or plaintext (plaintext can be dumped into a ".txt" file and encrypted).
Versions of PGP that should make you run away screaming:
Versions of PGP with these Version: strings are based on the BouncyCastle Java crypto libraries. They should be avoided like the plague.
Version: BCPG v1.45
Version: BCPG v1.47