How would I change it to a .iso? Also, will I need any software to mount the image, I used to use Daemon Tools on Windows but have heard Tiger has this kind of thing built in?
It is an image file usually of a CD or DVD made by Roxio Toast.
Mac OS X's built in DiskImageMounter can open .toast files easily. It should open automatically with it, by simply dubble-clicking on the file.
How would I change it to a .iso? Also, will I need any software to mount the image, I used to use Daemon Tools on Windows but have heard Tiger has this kind of thing built in?