Microsoft Xbox 360 posted sales of 240,600 units, up from about 220,000 units a year ago. The Xbox 360 version of the game “Prototype” was the top seller in the U.S. for the month, with 420,000 copies sold. The U.S. video-game industry overall posted sales of $1.17 billion in hardware, software and accessories for the month. That was down 31 percent from June of last year, according to NPD statistics. Overall sales of video-game Sony’s PlayStation 3 came in at 164,700 units, down from a result of more than 400,000 units a year ago — although that past result was boosted significantly by the launch of “Metal Gear Solid IV,” so the comparison isn’t entirely fair. Sales of Nintendo’s Wii fell to 361,700 for the month, from more than 660,00 the same month last year, but NPD analyst Anita Frazier pointed out that the console is still doing well.