Comparing regisrty entries?

Is it possible to compare two exported registries (let’s say one was exported and saved a week ago, and now I would like to do the same with the current). I want to see what kind of changes have been made within that time.

They are huge text files (65 MB), so please don’t tell me to compare them side by side, either! 🙂

This is in a Windows XP Pro environment, but not likely that information is really needed…

Any suggestions would be greatly appreciated!