yeah.. it's a shame when tools like this aren't open source
HxC being open source was VERY useful as I was able to hack the code in order to extract working images (ignoring sector sizes) from the .raw dumps of the Magnet System games for example.
(I couldn't see a way to force such behaviour from the command-line or GUI at least)
definitely limits how useful the tools are if you don't have the code to play with.