Command Line Decryption

I can’t find anything in the documentation about this (encryption yes, decryption no).

The line I was given by someone already using this software (he’s actually encrypting what I’m decrypting) is:

gpg --passphrase-fd 0 --decrypt-file C:\temp\REDEMPTION_TC_20110119.txt.pgp < C:\temp\passphrase.txt

Where passphrase.txt contains the passphrase. Unfortunately this fails with the message:

gpg: encrypted with RSA key, ID 88BD0CC6
gpg: decryption failed: No secret key

So I’m at a loss.