Does anyone know a good free file compare utility for ASCII files?

The feature that I really need is a specifiable comment character-
i.e., "lines that start with ' should be excluded from comparison
until a new line is reached".  I'm recommenting and refactoring
old code, and I need a way to see what's changed in type 1
between versions A and B so that I can upgrade types 2 and 3
from their current version to their next version.

What a pain.

Mike H.
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