|thanks for your reply, mickliq.|
in the 'old' days, before 'themes' like 'luna',
a customized appearance for the GUI
was called a 'desktop theme';
and its configuration being saved
with a '<name>.theme' filename.
i see that the 'theme' called 'luna'
uses both a '<name>.theme'
as well as an 'msstyles' extension;
which implies the visual config (?).
the nice link you have provided, mickliq,
actually describes a setup similar to mine.
so, yes, u are psychic indeed :)