Let's say my little cousin encrypted one of my chat logs, the contents of which bare some importance to me. I don't know what he changed it to, and he is refusing to tell me what it is so is there any program or something which can automatically decrypt my files. I really need to see whats inside the chat logs, but I can't open them.

Do you know the password of the file? If so, you can use Log Manager to decrypt the file. If not, then there's no way to decrypt it. You need the password to decrypt it.