[NFBCS] Repairing damaged audio files

[Dale HELTZER]

I have a small number of wav & mp3, and 1 wma file that appear to be damaged - none of my media players or editors will play them.
I've tried using Audacity with the ffmpeg add-on, but it seems I'm not doing something right, and haven't been able to recover the audio.
Is there someone who could talk me through the recovery process like the lost newbie I am?
Thanks