DUFF is (will be) a tool for Windows used to find and process duplicate files on a computer file system and/or network.
It will have numerous built-in and plugin-based file comparison layers, duplicate markers, and fileset processers.
While searching, crashes on my Windows 8.1 64bits
From the UI I found parametrized search offered by this small utility a very promising, However it crashed while collecting file list.
I was recommended Ashisoft Duplicate Finder to solve the duplicate files problem, and i must say that this http://www.ashisoft.com program really impress me a lot.