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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
ETL - Extension Details
Date Added: November 03, 2009
File Extension:  .ETL
Description 1: .ETL file extension is linked with Active Media Eclipse Transition Listing. This is the file extension for the transition listing utilized by Eclipse an opensource community with projects that are mainly focused on building open development platform which is composed of extensible frameworks, runtimes and tools for building, managing and deploying software. Eclipse is owned and developed by The Eclipse Foundation.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  utilized by The Eclipse Foundation for its opensource projects
Common:
Extension: