The thing with PC is that there's really no such thing as official or unofficial. Tomorrow if I wanted to box 1000 copies of a game I made and sell it on a personal website, I could. You don't need a publisher or have to go through any governing body to put a game on PC "officially." -At least that's the case in America. I know in some European countries (Germany) in order to be put on a physical retailer shelf you are legally required to get rated, otherwise you can only do web or mail order.
Personally I think as long as they have a barcode it can be official. At least they went through the trouble of getting one for a retail release.