Duplicate file finder allows you to search for same size byte files on fixed hard drives. Files are compared byte for byte and do not rely on file name to make a match. When two or more files exhibit the same contents, the files are listed as duplicate files. In order to accelerate the duplicate file search, you can specify file extensions ( e. g. Picture extensions bmp, jpeg, gif ) Be careful: Not all files that are duplicates may be deleted. Sometimes specialized knowledge is required to know which duplicate files may be deleted!!