If you want to mount an ISO file under Linux without burning a CD or DVD this is the way to go. Once it is mounted you can add, edit and remove files into this ISO and afterwards you can save the changed ISO file.

To start mounting:

losetup /dev/loop0 my.iso
mkdir /mnt/myiso
mount /dev/loop0 /mnt/myiso
cd /mnt/myiso

You can now access the ISO files as a normal file system. You can also write files to it etc. If you add files or edit files, don't forget to unmount correctly or do a manual 'sync'.

unmount /mnt/myiso
losetup -d /dev/loop0