I checked all directories for certain mp3 files that I knew were in the limewire shared direcory,
from what I can tell, my guess is that originally the program defaulted to C:\Program Files\LimeWire\Shared
After installation I went into the library window, changed the share directory to c:\My Documents\Shared Documents\Music
which windows me also sees as c:\windows\All Users\Shared Documents\Music
After I changed the share directory, I deleted the C:\Program Files\LimeWire\Shared directory as I no longer needed it and didn't want too many shared directories.
I assume now that limewire was still putting the files into the location on my HD that used to correspond to C:\Program Files\LimeWire\Shared. As limewire was the only program that could see these files, SEVERAL searches with windows explorer never found these files (again all hidden & system files were visible), yet limewire could see and play them. Now after changing the shared directory again limewire cannot find them either, They are probably all just lost clusters now....