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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:
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AI - Extension Details
Date Added: September 17, 2008
File Extension:  .AI
Description 1: .AI file extension is linked with Progress Database After Image File. This is the file extension for the database after image file utilized by Progress ObjectStore is also referred to as ObjectStore OBDMS [Object Database Management System is a tried and tested technology for developing consistent, highperformance and solid applications. This embedded database provides reliable, transactional database management solution to developmental database environments. Progress ObjectStore is owned and developed by Progress Software.
Description 2: .AI file extension is linked with Advantage Database Server File. This is the file extension for the database file utilized by Advantage Database Server File an application designed specifically for ISVS [Independent Software Vendors], small and medium businesses, and commercial software application developers that are looking for powerful database solution that is easily managed, deployed and integrated. .ADI and Advantage Database Server are owned and developed by Sybase Inc.
Description 3: .AI file extension is linked with AIwin Project File. This is the file extension for the project file generated and utilized by AIwin a specialized software that helps users calculate the minimum requisites as per the Technical Building Code and design of: indoor air quality in establishments and buildings, habitable premises, parking garages, and storage rooms. AIwin is owned and developed by ProcedimientosUno, S.L.
Description 4: .AI file extension is linked with Adobe Illustrator File. AI file is a vector image file that is created by Adobe Illustrator. It is composed of lines or paths connected by points, and not by bitmap data. The file may also include text, color and objects. It is also frequently referred to as an Illustrator drawing. Users can open Illustrator documents using Photoshop, however the image will be on a bitmap format converted from vector image. .AI file extension and Adobe Illustrator are owned and developed by Adobe.
File Type:   Vector Graphic File
Mode: Binary
Program(s) to Open:  Windows: ACD Systems Canvas, Adobe Acrobat, Adobe Illustrator, Adobe Photoshop, IMSI TurboCAD; Mac: Adobe Acrobat, Adobe Illustrator, Adobe Photoshop, Apple Preview, IMSI TurboCAD
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