Brilliant stuff. I got my hands on the original GfxRip only yesterday morning before I later stumbled across this little gem. You've done a great job modernising it.
I think this is a bug.. or perhaps I just couldn't work out otherwise.. In the Map Search tab, once I've chosen to apply one of the colour replacement tools, I am then unable to adjust the selection area.
Also.. On loading the app, it immediately errors with: Access violation at address 76F6ACB2 in module 'nt.dll'. Write of address 00404FA1. It then continues on happily
(Windows 7 32-bit running under VirtualBox)
Good work with this, it's rather good.