I am new to Steam and unfortunately wasn't aware that not all games run on Mac. I have just purchased "NightSky" and it says it is not available on my current platform. What a shame. Is there any way I might be able to get my money back for this? I don't have a different machine I can play it on so I'm a bit stuck really! It's my own silly fault for not looking at all the information, but it would be great if there is any way I can get a refund/exchange.