OK, the question is very n00bish, but I rather make an idiot out of myself
that foul up the installation.
Am I correct that I can ad lib rename everything in runtime/libraries/$category
and downloads/runtime/libraries/$category as long as I keep my hands off
runtime/texture and runtime/geometries which ARE sensitive?
E.g. I have 1000 props and want to move /props/foobar to
/props/Architecture/Interior/Bar_Stuff/Foos_Stuff so I can actually find things?

Hauke