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There are many utilities to find duplicate files. But, for some unexplainable reasons I can’t find a utility to find the ‘comlementary’ of duplicate files or call it the list of all mutually exclusive files between two (and ideally more) paths, A and B. To put it in other words if not clear, list all files that exist in path A and NOT in path B and vice versa.
(Notes: I am surprise because it takes adding/changing few lines of code of a ‘find duplicates’ utility to accomplish its complementary).

As usual, there should be filters for at least file types, both for included and excluded files.

Also as usual, comparison method options should be: 1. File’s name+time-stamp(of last change)+size, 2. File’s MD5, 3. File’s SHA.

I don’t mind to pay for a good professional application.

Thanks,
David