Decrypting WikiLeaks insurance file

[Johan Wevers]

Hello,

I read that the password for the insurance.aes256 file WikiLeaks
distributed some time agoo has been revealed to be

CollectionOfDiplomaticHistorySince_1966_ToThe_PresentDay#

(talk about a long password). However, which tool is used to encrypt it?
I tried decrypting it with gpg (no valid OpenPGP data found) and with
openssl with the command

openssl enc -d -aes256 -in insurance.aes256 > out.dec

which gives an error after copying almost the entire file to out.dec.
Does someone know which tool to use? And yes, I know the decrypted file
can be downloaded from TPB but I'm just curious about the encryption.

-- 
ir. J.C.A. Wevers
PGP/GPG public keys at http://www.xs4all.nl/~johanw/pgpkeys.html