I have several files that have different file names, but I think are duplicates of them. Is there a free program that can compare files of different names and file sizes to see if I have duplicates? The files had japanese characters in the file names and when I combined a bunch of them to another machine, the names all converted to boxes and question marks. I know there are duplicates. They are japanese songs and I don't want to listen to all of them individually to see which ones are duplicates.