QuickBooks File Doctor is a diagnostic tool provided by Intuit, the company behind QuickBooks software. It is designed to troubleshoot and resolve common file-related issues in QuickBooks. The tool helps in diagnosing and repairing problems that may prevent QuickBooks from opening or functioning correctly, such as network connectivity issues, data corruption, or Windows firewall settings. QuickBooks File Doctor scans and attempts to fix the identified issues, ensuring the integrity and stability of QuickBooks files and improving overall software performance.