The main utility of Quickbooks File Doctor is in resolving damaged files in QuickBooks. It also resolves the following issues :

Missing or blank list of vendors, employees, and customers.
The H series code (H101, H202, H303, and H505) and 6000 series code (6000 82, 6147, 6130, etc) errors.
Any QuickBooks company file that is damaged.
Quickbooks Company file that fails to launch.
An U problem that appears while launching the company file.