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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
KEXT - Extension Details
Date Added: February 10, 2008
File Extension:  .KEXT
Description 1: .KEXT file extension is linked with Mac OS X Kernel Extension. .KEXT file extension is used by a specific hardware device or application. It is also a device driver that is often used by computer peripherals. .KEXT file is mainly located in /System/Library/Extensions folder. .KEXT files should not be manually removed or opened because it can cause kernel panic to Mac OS X, which then leads to computer freeze.
File Type:   System File
Mode: Binary
Program(s) to Open:  Mac: should not be opened or edited
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Extension: