You may be out of luck. When google went to Android 4.x, they switched to the MTP protocol which mounts the phone to the computer as a media device, rather than a mass storage device (as in previous versions of Android). As far as I can tell, devs have only been able to figure out how to get the external SD card to be seen as mass storage (and that's built into a rom, not a stand alone mod, I believe).
Is there any file recovery software/app available for Android that you can install directly on the phone, rather than needing to run it from a computer?
Whether you turn to the right or to the left, your ears will hear a voice behind you, saying, “This is the way; walk in it.” -Is 30:21
"You may all go to hell, and I will go to Texas." -Davy Crockett