Using Kubuntu 12.04.01 on a dual-boot computer, I have entered System Settings >File Association to open rtf and richtext files with LibreOffice Writer set as preference over Kate and GNUEmacs. I have several files with .rtf suffix originally created by Windows, although modified and/or renamed by Kubuntu. In spite of my having changed the file association as above, Kubuntu insists on trying to open them from Dolphin with Kate which can't read them properly.
"Open With" is an easy workaround, but I believe Kubuntu should do better. Is it a minor bug,or have I missed something? If a bug is it in Kubuntu, LibreOffice, or Kate?