K-Meleon has a lot of changes behind it already, might be it's different again
Early versions used
<$PROGRAMFILES>\K-Meleon\Profiles\profiles.dat as the index file for profiles. Quite bad of course.
Soon afterwards, it went to
<$APPDATA>\K-Meleon\registry.dat, which is more the Mozilla/SeaMonkey style (plus
<$APPDATA>\Roaming\... and
<$APPDATA>\Local\... for Vista of course).
Just guessing, do you see a file
<$APPDATA>\K-Meleon\profiles.ini now? That would be the Firefox profile scheme that more and more Mozilla clones are using.
Or did they switch to the FF3 base already? But that should be supported in the stand-alone immunization demo then.