This should work, root should be able to open any file:
Code:
[don@localhost ~]$ su
Password:
[root@localhost don]# kate /etc/lilo.conf
This is what you should expect to see:
http://img258.echo.cx/my.php?image=kate8zs.jpg
normally I use vim instead of kate for editing, and is a good idea to learn to use, incase you foobar your gui. Vim works in command line, kate does not. Kate does work in gui for what you are trying to do, and is equivalent of the windows basic text editor (can't remember what they call it anymore).