Notes about the AT3 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 AT3 file type is primarily associated with 'Airport Tycoon' by Global Star Software. In Airport Tycoon 3 you'll establish yourself as an airport mogul as you strive to build and manage the busiest airport in the world.