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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
TFRD - Extension Details
Date Added: March 11, 2008
File Extension:  .TFRD
Description 1: TFRD is short for Tape Image Format Requirements Document. A .TFRD file is associated with the imaging data format that the National GeospatialIntelligence Agency uses to store geolocational info. TFRD files often contain both image and text data. They are much like .NITF files, only .TFRD files involve greater compression. Various NITFS program applications can read TFRD files.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: BAE Systems VITec PC, GIV, ILT Plus, ImageScout, ITT Visual Information Solutions ENVI, RemoteView Windows Unix: BAE Systems VITec ELT, RemoteView UNIX
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