Well, I've been happy with PGP 2.63i for years. Until users of PGP 6 and 7 began to send me their keys. I figured out that the only way to handle that on my Linux is to move to PGP6.
Secret key is required to read it.
You do not have the secret key needed to decrypt this file. Looks like I can't read any PGP encrypted texts with PGP6.