Need to recover files on FAT16?

Hi people, I have a system that has FAT16 file system on it. I have that file system on that for some reason so I don’t need to upgrade on that….but recently I had some files deleted and now I need to get them back. They are important for my official use and hold great importance. I know that there is software for recovery but since I have a FAT16 file system I guess that all won’t work on that.

Please let me know the solution for this problem.