Error Code -6190, -83: “QuickBooks was unable to open the corporate file” is a mistake which will occur when running QuickBooks in multiuser mode on Windows Server. It’s caused because multiple workstations are configured to host the corporate file (incorrect) rather than all workstations having a Hosting setting of off and a server configured with a Hosting setting of local files only or local and remote files (correct). For more info call now-1-855-481-5338.