Here's how I set up KDE to automatically edit .iso files when I click on them. First, paste the following script into a text editor, name it mntiso and save it somewhere in your path, such as in the /bin or ~/bin directory:

#!/bin/sh
dir=/mnt/iso
mkdir $dir
mount $1 $dir -t iso9660 -o loop,rw
konqueror $dir
umount $dir
rmdir $dir

Now simply right-click on the .iso file and choose "open with..."

Type in kdesu mntiso in the box.

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