Bug 467059

Would be cool to be able to use kdiff3 to also check directories for differences even when they contain e.g. image files.
kdiff3 already can compare binary wise, so I can already see if any images (in my case PNGs) are different, but when I then only see the list of different images, it would be nice when I could directly start an external program to show me the actual difference between the two images (e.g. I created my own pixel difference program).
This mechanism of course should work for any type of file, so I should be able to configre an external diff tool per file type.