The Federal Trade Commission says it it appealing a judge's ruling that would have allowed Microsoft to close its deal to buy video game company Activision Blizzard. A Wednesday court filing from the FTC says it is appealing it to the San Francisco-based U.S. Court of Appeals for the Ninth Circuit. Antitrust enforcers at the FTC have been trying to stop Microsoft's $68.7 billion takeover of Activision Blizzard, maker of popular game franchises like Call of Duty, arguing it will harm competition in the video game industry.