Take a copy of your original file, not your modifications, and a copy of the new file from the patch. Compare them with FC (a basic DOS command). Save the results to file, since it will be large:
FC file1.txt file2.txt > differences
Load the differences into a text editor and go over your modification in another editor. This is how I handle changes to the beta for my own custom data set. Yes, it's tedious but less tedious than comparing the whole files by eye.
[This message has been edited by Baron Munchausen (edited 22 November 2000).]