If you use a recent version of Windows, 8.1 lets you mount ISO files as drives. I have never tested whether games will accept them as CD / DVD drives, but I know that in my day-job with legitimate software, this technique works.
Of course, if this is something you know you might need again later, you can just burn it to a DVD. Not that I condone this semi-piracy... I mean, you should all be ashamed of yourselves... Maybe...
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Mentathiel Rogue and haunter of level-inappropriate dungeons
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