All files that by default open with text editor have changed to realmedia files, but only when I login as root, or when I use File Manager in su mode. I think that answer must be somewhere in /root/.kde/share/config folder, but don't know which file.
I run debian disto kanotix with kde desktop. Cheers.

Try opening the properties dialog for one of those files while operating as root and opening the "Edit file type" dialog by clicking the button with the little wrench icon on it. Examine the filename patterns list and the application preference order list to see what KDE thinks your files are and what applications it thinks should open them. Is the filename pattern messed up? Try fixing that. Is the application preference messed up? Try fixing that.

Also, try opening the KDE Control Center. Select KDE Components, and then File Associations. Select all and then allfiles from the list in the center column. Is there an associated application there? Try deleting the application from the list and trying again, if that is the case.

Thanks for reply. I can't deal with that at the moment i'll be back tomorow. Cheers.