No idea how they were stripped, but sadly and more importantly, no idea about how to restore it.
But Googling around, I found this:
http://www.audioforums.com/forums/showthread.php?15778-Corrupt-wav-file-repair-help
Which suggests that good old free Audacity might be able to repair it by reading the raw data.
Audacity works on files by putting them in its own format, .aup, and then if you want to play them back outside Audacity, you have to Export as… or Save as…
If you export or save them as .wav, they are going to be humongous, and a big strain on memory, so I suggest Export as Mp3.
You’ll need to get Lame for Audacity and install it before you do that, as explained here.
This is way beyond my specific knowledge, but it’s worth a try.
