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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
GCF - Extension Details
Date Added: May 09, 2008
File Extension:  .GCF
Description 1: .GCF file extension is linked with HalfLife 2: Episode Two Game Cache File. The cache file is used by the game's development software. A virtual file system may contain file fragments, checksums, metadata and other data that are used for updating the software. Originally, GCF stands for Grid Cache File, now it's been updated to Game Cache File. It is also the format that is utilized for storing downloaded official contents and games. .GCf file extension and HalfLife 2: Episode Two are owned and developed by Valve.
File Type:   Game File
Mode: Binary
Program(s) to Open:  Windows: Valve Steam or GCFScape
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