2.5 HD enclosure-where is it?

I recently bought a usb enclosure for a fujitsu 2.5 hard drive that came out of an mp3 player. I wanted to use it to access the files on the drive through my computer because my mp3 player stopped working. So I plugged it in, windows recognized it and everything, but I don’t know how to get to the files. It shows up in device manager and says it’s working and everything. Is there a way to get to my mp3’s?