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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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KFL - Extension Details
Date Added: January 01, 1970
File Extension:  .KFL
Description 1: .KFL file extension is linked with KFLog Airfield File. This is the file extension for the airfield file utilized by KFLog an opensource program designed for glider plots. It provides users with a powerful tool to plan their flight tasks before flying, and analyze flights afterwards. It is the only flight analyzer program that is available for Linux and it is recognized by the FAI IGC. KFLog makes projections on flights using a digital vector map that contains airfields, airspaces, as well as a complete elevation map, cities, rivers, roads and other objects. It is designed and developed by the KFLog Team.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Linux: KFLog
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