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ISO images may be mounted in the file system similar to a physical cd or dvd. This is done in the same way as you mount any other device, mount only needs a few directions:

mount -o loop -t iso9660 <source iso> <target dir>

for example:

mount -o loop -t iso9660 ubuntu.iso /media/myiso

If you are frequently using ISOs it may be more convenient to apply a Nautilus script for the task, see [http://doc.gwos.org/index.php/Mount_ISO_script]