How do you open a iso file?

You need to use a piece of software capable of understanding an ISO file, or burn the file to a disk. You can use Gizmo for Windows, both the 32- and 64-bit, from here: arainia.com/software/gizmo/download.html. The latest versions of Windows, Linux, and Mac OS will allow you to burn the ISO file to a disk; once you've done so, you can use it as a regular disk. Linux allows an ISO to be mounted directly into the root file system using the "mount" command.
You need to use a piece of software capable of understanding an ISO file, or burn the file to a disk. You can use Gizmo for Windows, both the 32- and 64-bit, from here: arainia.com/software/gizmo/download.html. The latest versions of Windows, Linux, and Mac OS will allow you to burn the ISO file to a disk; once you've done so, you can use it as a regular disk. Linux allows an ISO to be mounted directly into the root file system using the "mount" command.