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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
BTK - Extension Details
Date Added: January 01, 1970
File Extension:  .BTK
Description 1: .BTK file extension is linked with CLwin Tekton Database. This is the file extension for the database file generated and utilized by CLwin an application that estimates the thermal loads that affect a building or a premise, and determines air conditioning characteristics such as heat output, power cooling, ventilation, battery parameters, air flow and others. The method of calculation is based on ASHRAE transfer functions. CLwin is owned and developed by ProcedimientosUno S.L.
File Type:   Database File
Mode: Binary
Program(s) to Open:  Windows: CLwin
Common:
Extension: