While working on an urgent project, a co-worker sends you a critical C4B file you urgently need—but when you double-click it, you’re greeted by that ominous Windows alert:"Windows can’t open this file (C4B). Try an app on this PC."You scramble t... https://interior01.netpro.co.kr:443/bbs/board.php?bo_table=free&wr_id=45