.NTRK files are encrypted files created by the flight simulator game 'Pacific Fighters' which store position and time information for all objects during a mission. .NTRK files contain an "online" flight mission recording, and can be created using the "Quick Record" feature found within the game. .NTRK files can also be created by clicking the 'Start Recording' button on the game menu during amy mission. NTRK files are used to compete in online laddera and can be played back within 'Pacific Fighter'.