How to recover, a NAS, with Linux on it, damaged FAT32 partition... getting original files names ?

Due a hardware failure i need to recover, on a NAS, with Linux on it a damaged FAT32 partition...

So we can't do using NAS tools due electronic damage.

We have get out the hard-disk from the NAS and we have mounted it on another pc as slave with Ubuntu on it.

We cannot mount the damaged FAT32 partition because it have an invalid superblock.
Forcing mount partition using "mount -f ..." works but we cannot see any files on it.

So we have used Testdisk and Photodisk to try to recover files from this partition.
Photodisk works fine but it can't recover original directory and file name, Photodisk rename recovered files and directory.
While using Testdisk we are able to restore files one by one, with original name, and we can browser directory structure, but we haven't find any options to select them all to achieve an automatic recover of all files on this partition.

Do you have some suggestion about this...?
Do you know some other tools under Linux we can use to try to recover original files name ?

Thank you