Files that contain the .pk3 file extension are most commonly associated with the Quake III gaming application, although other software games have also been known to use the PK3 file format.
The PK3 files that are used by the gaming software contain compressed game data files. These files store a variety of game details that are used by the game engine, such as the terrain maps, textures, audio clips and other data that is used by the computer in the play of the associated computer game.
The PK3 files on a user's computer can be manually modified in order to customize the content of the game.
Other popular gaming software that uses the PK3 file format include Star Wars Jedi Knight II and Soldier of Fortune II.
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