Well an iso it's a disk image. So basically it contains files compressed into iso. To write it to a cd you have to get into your cd burner software, and there should be an option that says "Copy image to cd" or something similar. But you can't just write it as a regular file, you have to select the copy image or iso image to cd, since that option will break up the files for you. ANd you'll be able to write it to a cd.
Now you mentioned that you wanted to get around it and mount it, you haven't specified how you tried to mount it, so i'll give you a couple steps and look trough it see if this is how you did it.
1) You must login as a root user, open a terminal and type:
2) Create the directory aka mount point:
mkdir -p /mnt/disk
3) Use mount command as follows (lets say tht your iso file is called disk1.iso):
mount -o loop disk1.iso /mnt/disk
4) Change directory to list it:
See if you missed anything. Wish you the best of luck.