If QuickBooks File Doctor is not launching, the issue may be caused by an outdated QuickBooks Tool Hub version, installation problems, damaged program files, or Windows compatibility settings. Try restarting your system, updating QuickBooks Tool Hub, running the tool with administrator access, or reinstalling the utility. These steps can help restore File Doctor functionality and resolve company file troubleshooting problems. For assistance with QuickBooks File Doctor and related errors, call +1(866) 513-4656.