Sorry to necro this old forum post but I wanted to comment here for the other Windows peons like me. And because I will probably have to do this again and not remember how I did it.
I installed openssl and removed the first and last lines of the config.xml file and then ran this command.
c:\openssl\openssl enc -in config.xml -base64 -d -aes-256-cbc -md sha512 -iter 100000 -out decrypted_config.xml
I installed openssl and removed the first and last lines of the config.xml file and then ran this command.
c:\openssl\openssl enc -in config.xml -base64 -d -aes-256-cbc -md sha512 -iter 100000 -out decrypted_config.xml