ISO files are sometimes recognized with the text/plain mime type, while the command "file --mime-type file.iso" returns application/x-iso9660-image. I've tried in ROX Filer, and there it works correctly. Reproducible: Always Steps to Reproduce: 1. Try to download an ISO like this: http://heanet.dl.sourceforge.net/project/bodhilinux/3.0.0/bodhi-3.0.0-64.iso 2. Open the folder in Dolphin 3. Open the folder in ROX Filer (or other file managers) Actual Results: Dolphin treats the file as text/plain. ROX Filer and the file command treat the file as application/x-iso9660-image. Expected Results: Dolphin should treat the file as application/x-iso9660-image. Other ISOs may work correctly, though. For example try to download Ubuntu 14.04 LTS ISO. With it, Dolphin says correctly that is an application/x-iso9660-image file.
Thanks for the bug report! This is a known issue, which is caused by a change in the shared-mime-info package. It is fixed in the latest version of that package as far as I know. *** This bug has been marked as a duplicate of bug 337035 ***