How to Mount a file (iso) under FreeBSD 5.x and higher versions
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You can mount an iso file or a file that contain a partition recovered with dd using:

mdconfig -a -f file.iso -u md0         #   -t vnode
mount -t cd9660 /dev/md0 /mnt/recover

After you've recovered/copied data from that file, you will release the memory device with:

umount /mnt/recover
mdconfig -d -u md0
 
If the image is .udf format mount the image using:
mount -t udf /dev/md0 /mnt/recover