Notes about the QF file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The QF file type is primarily associated with 'Dispatch' by Scott Andrew Borton. Dispatch allows you to view airline routes overlaid on a map. If you like, you can set Dispatch to show only those routes which should currently have airplanes in the air (based on your system clock), and Dispatch will display the approximate progress of those airplanes along their scheduled routes.