I have no mp3 files, but the following settings worked perfectly … it found 26 files representing 11 instances of duplication.
Files to find:*.wma; *.jpg
Search in:L:\+A\!E\CDs\Selections\Billy Joel Greatest Hits Vol. I
L:\+A\!E\CDs\My CDs\Rock\Billy Joel Greatest Hits Vol. IMatch criteria:… identical contents
Options:all six boxes not checked
Ignore words:none
This was in the message box when it finished:: L:\+A\!E\CDs\My CDs\Rock\Billy Joel Greatest Hits Vol. I analyzed.
: L:\+A\!E\CDs\Selections\Billy Joel Greatest Hits Vol. I analyzed.
: The Duplicate File Finder is now finished. The found files are listed in the Duplicate File Finder window.
Warning: It's not safe to remove all the found duplicate files! Only use this tool for finding duplicate files from your file collections (e.g. duplicate files from MP3 music collection)._/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Here's a test that should determine if DFF works with a forced .mp3 duplication scenario:* Create a folder named Dupck on your desktop
* Inside Dupck, create two subfolders named D1 and D2
* Copy and paste the same file or files from c:\My Music\Elvis into both D1 and D2 (just one file is sufficient for the test -- do a few more if you wish)
* Point DFF at Dupck on your desktop to find *.mp3_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
If it doesn't find the duplicates you forced, there is likely a bug in DFF with the mp3 file type.
If it does find them, then the mp3 compression technique itself may create non duplicate bit strings in the same song captured at different times with different MP3 encoders. If that is the case, the same song in a different file may not be a duplicate even if it sounds the same.