A QBX file is an accountant’s transfer copy of a QuickBooks company file. a corporation enter this format can't be modified apart from adding journal notes. If a client has sent you a QBX file, you can't use it until you either convert it to a “regular” accountant’s copy file (QBA) or a corporation file (QBW). you'll only open or convert files saved within the current version of QuickBooks. For more information contact now-1-855-481-5338.