The PAK file extension is associated with ZLIB, a software library used for data compression. The PAK files use ZLIB compression format and they can be uncompressed compatible archive tools.
The PAK file extension is used by Simutrans, a free transportation simulation game. PAK file contains game object graphics and properties. PAK file is used for game vehicles, buildings, terrain, and other objects.
The PAK file extension is used by some video games for their resource archives. The PAK files include graphics, objects, textures, sounds, and other game data. Some PAK files can be simply be in common archive formats.