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A .PK3 file is a renamed ZIP file, used in games based on the Quake III engine. It usually contains a checksum to prevent the opening and recompression of the file, or the addition of extra maps to demo versions. The .PK3 file contains the maps, models, textures, weapons, sounds, scripts and other assets for the game.
They can usually be viewed or extracted using a file archiver with support for the ZIP file format. PK3 files can be created using software designed for that purpose.
Quake Live also uses PK3 files. These files used to be encoded by means of a bitwise XOR with a string of characters and therefore could not be opened with a regular ZIP program like other PK3 files. However, open source utilities have been created to decode these PK3 files, such as the quakelivedec program. As of October 2015 onwards, Quake Live uses regular ZIP-like PK3 files
Games which use the id Tech 4 game engine, such as Quake 4 and Doom 3, use an identical file type, .PK4 files.
Category:Archive formats
Category:Quake (series)
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