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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:
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PK2 - Extension Details
Date Added: September 10, 2008
File Extension:  .PK2
Description 1: .PK2 files contain game data that Silkroad uses. Silkroad is a massivelymultiplayer online roleplaying game (MMORPG) that the South Korean firm Joymax developed. The file often contains sounds, music, graphics and other features, and is saved in encrypted and compressed format. Media.pk2, Map.pk2, Particles.pk2 and Music.pk2 are some examples of PK2 files. Manual opening of Silkroad PK2 files is discouraged. Editing them is best done using the XVl32 hex editor.
File Type:   System file
Mode: Binary
Program(s) to Open:  Windows: Joymax Silkroad Online
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