Question: Comparing different versions of the same worksheet

During the evolution of my code I have ended up with numerous versions of similar files, each with minute differences to the next. Is there a way to compare these worksheets? I have seen software performing this task for MS Word files, text, html files, even pdf and images. I did try comparing 2 .mw files with one of these but the program just compared the underlying .xml structure, which is not so pretty to read. Then I thought about converting the documents to html and then running the diff program on them, which is not such a bad idea (albeit not so elegant). Is there another way?
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