Imho we should better use %APPDATA% if we decide to not leave the files
below the gnubg install tree. At least here on this machine no single
application has placed any file or folder directly in %USERPROFILE%.
The paths are:
USERPROFILE=C:\Dokumente und Einstellungen\username
APPDATA=C:\Dokumente und Einstellungen\username\Anwendungsdaten
Mozilla stores the user profiles e.g. in (thus in %APPDATA%\Mozilla):
C:\Dokumente und
Einstellungen\username\Anwendungsdaten\Mozilla\Profiles\default\lt7r8rzs.slt\