Hi,
Yes, as it was said by tristaanogre, as you need detailed and custom comparison report for some special data format, your options are either to parse that format yourself and compare according to your needs or to find a specialized comparison program/utility that can do what you need.
P.S. As a possible workaround you may consider to open the document in Word, WordPad, etc., set its window to some size, get an image of the document area and do image comparison with the base master image. You will need manually analyze later the reason of mismatch (incorrect highlighting, wrong hyperlinks, etc.). Obviously, this approach will work only if the same data are used for each test run.