Extension

File Type

File Description

.a

Developer

Static Library

.aac

Audio

Advanced Audio Coding File

.abf

Font

Adobe Glyph Bitmap Distribution Format

.abk

Backup

Automatic Backup

.acb

Misc

AOL Cab Launcher

.ace

Compressed

WinAce Compressed File

.acr

Image

American College of Radiology Format

.ad

Misc

After Dark Screensaver

.adc

Image

Scanstudio 16 Color Image

.ade

Data

Access Project Extension

.adf

Disk

Amiga Disk Image

.adi

Image

AutoCAD Device-Independent Binary Plotter File

.adp

Data

Access Project

.adr

Web

Opera Bookmarks File

.afm

Font

Adobe Font Metric File

.aft

Data

Ancestry.com Family Tree Database

.ahx

Audio

WinAHX Tracker Module

.ai

Image

Adobe Illustrator File

.aif

Audio

Audio Interchange File Format

.aifc

Audio

Compressed Audio Interchange File

.aiff

Audio

Audio Interchange File Format

.aim

Misc

AOL Instant Messenger Launch File

.ain

Compressed

AIN Compressed File Archive

.aip

Plugin

Illustrator Plug-in

.al

Audio

A-Law Compressed Sound Format

.alaw

Audio

A-Law Compressed Sound Format

.amr

Audio

Adaptive Multi-Rate Codec

.amu

Image

Sony Photo Album

.ani

System

Animated Cursor

.ann

System

Help Annotations

.ans

Text

ANSI Text File or Text Graphic

.aol

Misc

America Online File

.ape

Audio

Monkey's Audio Lossless Audio File

.api

Plugin

Acrobat Plug-in

.app

Executable

Mac OS X Application

.arc

Compressed

Compressed File Archive

.ari

Compressed

Compressed File Archive

.arj

Compressed

Compressed File Archive

.arr

Image

Amber Graphic File

.art

Image

AOL Compressed Image

.art

Image

Art Document

.asc

Text

ASCII Text File

.ascii

Text

ASCII Text File

.asf

Video

Advanced Systems Format

.ask

Data

askSam Database

.asl

Misc

Photoshop Style

.asm

Developer

Assembly Language Source Code

.asmx

Web

Active Server Method File

.asp

Web

Active Server Page

.aspx

Web

Active Server Page Extended

.asx

Video

Microsoft ASF Redirector File

.atn

Misc

Photoshop Actions

.atom

Web

Atom Syndication Format

.atz

Misc

Atomic Time Zone File

.au

Audio

Audio File

.avi

Video

Audio Video Interleave File

.avr

Audio

Audio Visual Research File

.avs

Video

Application Visualization System Format

.awk

Executable

AWK Script

.axx

Compressed

AxCrypt Encrypted File