Quickbooks File Doctor denotes that a file with the.qbw extension is created by QuickBooks when you create a company file. Your account details and company file are contained in this file. It is also a tool meant to assist in resolving some of your network problems and restore any damaged company data. It maintains company files in a secure setting along with usernames and passwords. With the app, you can quickly upgrade from one version of QuickBooks to another and import the files from clients.