OK, I'll give it a try. But I am afraid that last time during the installation the installation prog did not ask anything about any plugin directories (I already had the fake netscape.exe in my K-Meleon directory and that did not help).
It was almost as if the installer knew everything better (like "sit back and relax while I am reformatting the whole universe..."
. And anyway, I already got all the files RealPlayer may put into the Netscape directory - those files are namely nppl3260.dll (the *.rpm suffix) and raclass.zip - and put them manually into my K-Meleon plugins directory. So I think all this still has to do with MIME settings as called from K-Meleon itself.
But I'll rerun the installation just in case and let you know about any success. Thanks.