I have a problem with all my music files with `mp3` extension.

I had Mac OS X Snow Leopard and I made backup of all my files to hard drive and changed the internal hard drive to new SSD with fresh copy of El Capitan. After this operation I took all my files from the backup (video, music, jpg…) to my new SSD drive and everything was OK until I made a search in the Finder.

When I made a search for music file I could see only the title of the song without the `mp3` extension. I can't change or rename any files in the Finder search.

I can rename and see the entire filename only if I get inside the folder where the files are.

I have indexed all the hard drive in the Spotlight few times and it's always the same problem. This happens only with `mp3` extension. No problem with `mp4`, `jpg`, `pdf`…

I'm lost. Any idea what to do?