The correct way would be to create a program that scans the cd and the un encrypted version. Is a file is the same it isn't encrypted and you've found the file. Takes a lot less time then searching in 70000 files.
I wonder how the files ar encrypted maybe a robust cryptography architecture, using DES keys in CBC mode with a random initialization vector. Now, I know what you're thinking... "Morbo, the CBC encrypt uses a zero seed number so keys could be recovered by parallel processors running a virtual network protocol in a trivially short timeframe." But in my opinion, that's f* male cow excretions. <img src="/ubbthreads/images/graemlins/ROFL.gif" alt="" />
