Hrvoje, Interesting findings. GNOME shows the iso file as an x-cd-image. As long as the mimetype is iso9660 or x-cd-image, I guess it doesn't matter. Do you also see a CD icon representing the iso file? So far, I have not heard from any KDE4 dev that can provide a satisfactory answer where this bug resides in the KDE4 code. I'll be installing Tumbleweed and and Fedora 21 tomorrow.