KDE has no registry - but it does have a rain forest of files under /opt/kde3, and it replicates about a Bolivia worth of them for every new user, in his $HOME.
\n[voyager] drossl 2: ~> sudo du -s /opt/kde3\nPassword:\n604500 /opt/kde3\n[voyager] drossl 3: ~> sudo find /opt/kde3 | wc\n 39238 39287 2284965\n[voyager] drossl 4: ~>\n
Jeezus H! 600Mb in 40 freakin' thousand files!!