What is a ISO?
A ISO is the data which has been taken from an original video gaming cartridge or disc and transferred to a digital format which enables you to play it on your desktop computer without the use of an actual console system nor the actual hardware itself.
How do I open a ISO file?
You will need a special program to extract that file to get the contents out that are inside of it. Most of our files will be in a .zip format but some will be in a .rar file and others will be in .dmg, which is Mac based.
is one of the best program for extracting .rar files. Also note that some emulators will play roms even if they are in a .zip or .rar file.
on the otherhand is for Macintosh which has the ability to expand .rar files (which are PC based) and other files such as .dmg and .zip.