dyoon 153 (post no. 3 above) mentions 'Zero Assumption Recovery' and that would be an excellent choice to start with.
If that doesn't work,
I wonder if this could be recovered with Recuva which you can download here:
https://www.piriform.com/recuva
I have had good success with recovering what I thought were totally lost image files.
It does work on any "modern" Windows versions:
Here's a complete list of operating systems Recuva currently supports:
Windows 8 (all versions)
Windows 7 (Starter, Home Premium, Professional, Ultimate, 64-bit)*
Windows 2008 Server (all versions)
Windows Vista (Home Basic, Home Premium, Business, Ultimate, 64-bit)
Windows XP (Home, Professional, Tablet Edition, Media Centre Edition, 64-bit)
Windows 2003 Server
The newer version would probably be able to handle FAT32 volumes:
Piriform News - Recuva v1.51
Best of luck !
JP