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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
ATT - Extension Details
Date Added: August 03, 2009
File Extension:  .ATT
Description 1: .ATT file extension is linked with SeeYou Waypoint File. This is the file extension for the waypoint file utilized by SeeYou a highlyfeatured glider pilots program that provides users/pilots to plan tasks prior their flights, manage waypoint lists and upload them to a pocket pc or related devices. After a flight, this application allows users/pilots to download their flights from a GPS, see their flights on maps, explore details of flights via Statistics and review them in 3D. SeeYou is owned and developed by Naviter d.o.o.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: SeeYou; can also be utilized via GPS and Pocket PC
Common:
Extension: