If you want to restore file from .ptl try this,
Copy the xxxxx.mp3.ptl file to your internal drive then just right click on the file and change file name by clicking rename file. Then remove .ptl extension so you will be getting xxxxx.mp3 file and then enter then windows will ask you ďare you sure you want to change itĒ then donít get confuse and click yes And double click the file to open. But sometime your mp3 file will itself name as .mp3 but when you play it will not open it means it has change his type to PTL format then you can just recovered all file from this just using cmd command techniques.
Then type exit to come out from this
REN *.PTL *.