A PCK file, short for "Packed Data File" or "Package File," is a generic file extension primarily used to store collections of data in a single archive. Its most prominent use is within video games, where it serves as a container for various game assets such as textures, 3D models, audio files, scripts, maps, and other game-specific data. The internal structure of a PCK file is often proprietary and specific to the application or game that created it, meaning there isn't a universal standard for its content or compression. This proprietary nature makes it challenging to open or extract contents without the original software or a dedicated utility designed for that specific PCK variant. For example, the Godot game engine uses .pck files as its default export format to package all game resources into a single, deployable file. Other applications might use .pck files for storing application resources, configuration data, or other bundled information. Due to its flexible and often custom implementation, a PCK file essentially acts as a custom archive format tailored to the needs of a particular software, bundling diverse data types into a single file for easier distribution and management.