No, they aren't. They are application/postscript. They are NOT text files. By your same rule, PDF files are also text and thus, their code should be shown as well.
** Changed in: kdebase (Ubuntu) Status: Rejected => Unconfirmed -- cannot disable preview of postscript files https://launchpad.net/bugs/62285 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs