I have to say the 7/12 version is pretty much junk. It has no application icon, you can't drag&drop to the icon while it's in the Dock and doesn't work period because it can't find any files in the list to be changed. This is true if I use drag & drop to the window or select the files through the Open Dialog.
Does as advertised, simple and intuitive to use, not bloated and a positively unspectacular, fully drag and drop enabled user interface.
That's useful software. A big thank you and congrats to the author for this fine example of free software.