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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
AAT - Extension Details
Date Added: January 01, 1970
File Extension:  .AAT
Description 1: .AAT file extension is linked with ArcInfo Line Data File. ArcInfo is a complete desktop GIS for GIS professionals from ESRI. Among its many features include: provides users with complete tools to develop and manage a complete and intelligent GIS [which includes maps, globes, metadata, data, workflow models and geodatasets], advanced spatial analysis, highend cartography tools and extensive data manipulation. ArcInfo also offers userfriendly interface which is customizable and extensible all the way through scripting, modeling and other applications.
File Type:   3D Graphics, CAD, CAM Files
Mode: Binary
Program(s) to Open:  Windows: ArcInfo
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