http://www.grigsoft.com/wc3pics.htm
I actually have 1 somewhere in my storage drives that does exactly what you
were wanting ill check it out later and see if I can find it, its actually a
CVS File Compare utility for devs to compare version difference in coding,
but it can be used for pretty much any file that contains text, it will
export a html and will highlight, mark through ect.. changes. I have been
searching online, but can't remember the name of it and with so many tools
out there its hard to tell off hand which one it is. Anyways maybe get lucky
and one of the ones I posted already it is
Ill look though..