I've been plodding at this for a little bit and have no idea why it's so difficult to find. If anyone already owns the program or has even solved the problem, I'd be grateful.
Basically, fantasy ground .mod files for campaigns and such go into the /data/modules folder, simple enough. Mods the you buy through steam do not, and I would like access to these files to share when somebody else feels like DMing for the group or god knows what other reason. If anyone is capable of finding it or already has drop a note please.
EDIT: Regedit for fantasy grounds contains no useful information(I haven't looked too deeply into the steam registry yet), the .xml's are used purely for configuration and there're no sloppy file paths to make up for bad programming. Inside the program the user-set paths for the fantasy grounds information also only contain the data and module folder, so all of those are dead ends.