If your .iso file is contained in a .zip file, you wouldn't use ultraiso to extract it. You would use a file compression utility to extract the files, such as
WinRar or
WinZip.
If you're actually trying to extract files form the .iso itself, I'm not sure you want to be. Since it's an .iso of a game, my guess is your goal is to play it; extract files from it wouldn't make sense.
An .iso file is basically a disc image; a copy of all the data that was found on a disc and can be put back on a disc. To use it you can either burn it back onto a disc or use it as a virtual disc.
To burn it back onto a disc, you'll need a blank disc with enough space for the disc image to be burnt to. You'll also need to use some type of disc burning software, such as
Nero.
To use it as a virtual disc you have to use a disc drive emulator, such as
Daemon Tools or
Virtual Clonedrive. After you install the program you mount the disc image to the virtual drive; after that you use the virtual drive as if it had a real disc in it (you can autoplay, examine the files on the disc, etc).
Hope this helps!
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