Thanx a lot, it has solved my issue
Anyway my suggestion for future relases, mentioned command imho is not clear and can lead to misunderstanings as in my case.
Hi everybody :) I have two folders A and B. I'd like to delete duplicates which are in folder B. So at the first step I select folders A and B. Then as a search method I choose "file content". Search Options - nothing checked. Start searching - some files have been found which are in both ...