GCF is an acronym for Game Cache File. Files that contain the .gcf file extension normally store game data such as file fragments, checksums, metadata and other game information and game details that are used by an associated gaming application.
The GCF files that are created by gaming programs are commonly used to store games that have been downloaded from the Valve Steam distribution service. GCF files may also contain game updates for computer games that have been distributed by Valve Stream. This ensures that the user has the most recent version of the game installed on his or her hard drive.
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