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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
KDX - Extension Details
Date Added: January 01, 1970
File Extension:  .KDX
Description 1: .KDX file extension is linked with Google Earth Import Definition File. This is the file extension for the import definition file utilized by Google Earth a "virtual earth program which was originally known as Earth Viewer and was developed by Keyhole Inc. Not all computers can run this 3D application. Desktop computers that are older than 4 years ole may not be able to run Google Earth; same goes for Notebooks that are older than 2 years old.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: Google Earth
Common:
Extension: