I've just registered the premium version, because the program is worth it. Now I'm missing a key when I'm going over the duplicate files. Now there's the shortcut Ctrl+B, which opens a folder, but I miss a key that will open the folder and select the file within that folder. Ctrl+B is useful, but if you have 300 mp3s within that folder, you have to waste time looking for the specific mp3.
How about Shift+Enter to open a folder and select the file? (The same you would get if you chose windows explorer as the default program for mp3 files)