File Extensions beginning with the letter 'A'

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Extension click to sort by Extension Description currently sorted on Description Format MIME Type
Atari ST Graphics File Formats
ABF Adobe Binary Screen Font
ART Another Ray Tracer
AVS Application Visualization System
ADI AutoCAD Device-Independent Binary Plotter Format
ASP (1) Active Server Page; Internet script; see HTM
AMG (1) Actor
A (1) ADA programming language source code
API (1) Adobe Photoshop Ink Profile
ACL (1) Automatic Correction List for Microsoft Office 7.0a or later (WINDOWSUSER000.ACL -- release 7.0 used WINDOWSUSER)
ADM (1) Configuration; Microsoft Windows Setup Network Administration
ABK (1) Corel Draw automatic Backup
ADT (1) Data; Hewlett-Packard NewWave card file
APP (1) Database Application; dBase, FoxPro, R:Base Application
ADR (1) Database; Address book
AP (1) Datalex EntryPoiint
ADX (1) Document; Archetype Designer
AWX (1) Fax Document
ACT (1) FoxPro Action Diagram
AW (1) Help Wizard; Answer Wizard for Microsoft Help files
APR (1) Lotus Approach Database views; see OYZ, VEW
AWS (1) Microsoft Fax Document; Fax signature
ACC (1) Microsoft Image Composer.acc
ANI (1) Microsoft Windows Animated Cursor
APX (1) Paradox Database information for Lotus Approach
ASD (1) Presentation; Astound presentation
AMF (1) Sound; Advanced Module Format
ASF (1) StatGraphics
ART (1) Vector Drawing; Xara Studio
ALL (1) WordPerfect printer information
ADM (2) After Dark screen saver Multi-module; see AD
ADR (2) After Dark screen saver randomizer; see AD
AMF (2) Amiga Metafile
AMG (2) Archive
AP (2) Archive; Amiga, created by WHAP
APX (2) Borland C++ App-Expert
ACL (2) Corel Draw keyboard accelerator
AWX (2) Custom AppWizard (Delphi?)
ADX (2) Database Index; Lotus Approach Database; see OYZ, VEW
APR (2) Document; Employee Appraiser employee review
AW (2) Document; Hewlett-Packard Advance Write
API (2) Dynamic Link Library; Adobe Acrobat 3.0 Plug-in
ADT (2) Fax Document; AdTech
ABK (2) HP-95 Appointment book
ALL (2) Lotus 1-2-3 Always; see AND
APP (2) Lotus Symphony Application
ACT (2) Microsoft Office 97 Actor for help system
ASD (2) Microsoft Word for Windows Auto-save temporary Document
ANI (2) Picture; Atari ST
ART (2) Picture; First Publisher
AWS (2) StatGraphics
ASP (2) Terminal Program
A (2) UNIX Library
ART (3) (MIME: image/x-jg)
ACT (3) Actor source
ALL (3) Arts & Letters Font
APP (3) Atari ST Application
ACC (3) Atari ST program
ASP (3) Procomm Plus Program Script
ART (4) Bitmap Picture; Atari ST
APP (4) NeXT Application
ACT (4) Picture; Action
ASP (4) Software Publishing Corp. ASAP WordPower WebShow presentation
ACT (5) Adobe Illustrator or Photoshop Custom Color Table
ART (5) Clipart; Central Point Scrapbook
ASP (5) Text; Association of Shareware Professionals
AMX Anark GameFace 3D Model.
AF3 ABC Flowchart file
AF2 ABC Flowchart file
ABC ABC FlowCharter flow chart
ABS Abscissa Data
AB8 ABStat
AB6 ABStat
AIS ACDSee Image Sequence file
api Acrobat Plug-In
AFP Active FoxPro Page. Microsoft FoxPro variation on Active Server Pages
ASP Active Server Page (an HTML file containing a Microsoft server-processed script)
asp Active Server Pages
ASX Active Streaming Format, Internet Document; see ASF (MIME: video/x-ms-asf)
ADB ADA programming language package body
ADS ADA programming language package specification
ADA Ada source text (non-GNAT)
ADB Ada source text body (GNAT)
ADS Ada source text specification (GNAT)
ADF Administration configuration files
abr Adobe brush
act Adobe color table
AFM Adobe Font Metrics. Binary information about a font.
AI Adobe Illustrator file. A vector image. Details [ai] application/postscript
AIP Adobe Illustrator plug-in
AIR Adobe Integrated Runtime. A fat-client application written with in Adobe's Flash/Flex/AIR tools [air]
ADO Adobe Photoshop Duotone options
ATM Adobe Type Manager
AFS Adobe Type Manager Font set
AAF Advanced Authoring Format. Multimedia: details
AFP Advanced Function Presentation (originally Advanced Function Printing). IBM page description language. <a href=""
ADM After Dark MultiModule screensaver
ADR After Dark Randomizer screensaver
AD After Dark screen saver; see ADM, ADR
AD After Dark screensaver
ad Afterdark Screen Saver File
ACF Aircraft from X-Plane.
AT2 Aldus Persuasion Template
AOL America Online; see AIM
ACR American College of Radiology: a raster image file.
ADF Amiga disk file
AG Amiga Guide
ANI Animated cursor in a Microsoft Windows system
ANI Animated Cursors
ANI Animated pointer
APNG Animated Portable Network Graphics (PNG). Animated raster image. It is backwards compatible with regular PNG files, and often uses the .PNG extension. spec.
ani animation
ART Another Ray Tracer format
ANS ANSI text file
ATW AnyTime Deluxe for Windows personal information manager file from Individual Software MultiModule screensaver
AIM AOL Instant Messenger Launch
AIO APL Programming Language
ALX Application Loader XML. A file with information about a RIM Blackberry application.
API Application Program Interface file; used by Adobe Acrobat
AVS Application Visualization System format
AS Applix Anywhere Office
ADB Appointment database used by HP 100LX organizer
ARC Archieve files
ARJ Archieve files
AIN Archive
ARJ Archive
a archive
ACE Archive
ARC Archive
ARK Archive; CP/M; ARC or Quark
ARC Archive; Squash or ARC
ARI Aristotle audio file
AXX ARJ compressed files from a multi-volume archive (xx = a number from 01 to 99)
arj ARJ compression
ALL Arts & Letters Library
asc ASCII data
asc ASCII text file
ASM Assembler language source file
ass assembler source code
asm assembler source code
ASH Assembly language include; Borland TASM; see INC
A86 Assembly Language Source Code (old 8086 convention); see ASM
ASO Assembly Source Code; Borland TASM, object oriented; see ASM
ASM Assembly Source Code; see CAS
ASS Assistance for the blind?
ADP Astound Dynamite file
ASO Astound Dynamite Objects
AST Astound multimedia file
ASP Astound Presentation file
ATT AT&T Group 4 bitmap
ARR Atari Cubase
ACX Atari ST program
au audio [AU]
AFF Audio
ACM Audio compression manager driver
AIFF Audio Interchange File Format [AIFF]
AIFC Audio Interchange File-Compressed. Compressed version of AIFF [AIFF]
AIF Audio Interchange File. Same as AIFF [AIFF]
AVR Audio Visual Research file format
avi audio-video interleaved (movie)
A3L Authorware 3.x library file
A4L Authorware 4.x library file
A5L Authorware 5.x library file
A4P Authorware file packaged without runtime
AAM Authorware shocked file
AAS Authorware shocked packet
ADI AutoCAD device-independent binary plotter format
ARF Automatic response file
AWK AWK programming language
APS Binary version of Resource for Microsoft Visual C++
ATT Bitmap Picture; AT&T Group IV fax
ADC Bitmap Picture; Scan Studio
AFI Bitmap Picture; TrueVision
AIS Bitmap Picture; Xerox intensity samples (Array of Intensity Samples)
ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors
ART Canon Crayola art file
ASX Cheyenne Backup script
AST Claris Works "assistant" file
ART Clip Art file format
AXI Clipart; Axiom Composite File Management System (MetaToolsFile Kai's Power Goo Picture Library)
arc compressed file
arj compressed file
ACE Compression format associated with a program called The Ace Archiver
ADF Configuration; Windows Administration configuration file; INI
AKW Contains all A-keywords in the RoboHELP Help project Index Designer not associated with topics
ACL Corel Draw 6 keyboard accelerator
ABK Corel Draw AutoBackup
AIX Data; Hewlett-Packard NewWave card file
AGN Data; PSION Series 3 Agenda; see OPL
ALT Data; WordPerfect menu
ABX Database; Corel WordPerfect address book
APT Database; Lotus Approach Database; compressed, for Internet distribution
ASV DataCAD Autosave file
ADD Device Driver; Adapter Device Driver
AEH Document; Advanced Encapsulated Hypertext
AVA Document; Avagio Publication
ANS Document; Text With Layout (ANSI)
APM Drawing Aldus Placable Metafile
ACM Driver; Audio Compression Manager (Mapper), TrueSpeech Audio Decoder
ALAW European telephony format audio
AMS Extreme's Tracker module format
AWP FAX key viewer
AWS FAX signature viewer
AF2 Flow Chart; Micrografx ABC
AF3 Flow Chart; Micrografx ABC
AF5 Font; Adobe Type Manager Font Set
AFL Font; Lotus 1-2-3 Always
AFM Hewlett-Packard NewWave card file
AXS HTML; ActiveX Script
ASI Include; Assembly language header; Borland TASM, uncommon see INC
AVB Inculan Anti-Virus virus infected file
ALX Internet script language defines 2-D layout (ActiveX layout file)
ALB JASC Image Commander album
AIF KnowledgeWare Setup Information
ARC LH ARC (old version) compressed archive
ADN Lotus 1-2-3 for DOS Add-in program (between an overlay and a DLL)
APR Lotus Approach 97 file
aa4 MASS11
aa8 MASS11
aa5 MASS11
aa6 MASS11
aa7 MASS11
ASX Metafile which points to an ASF structured file (.ASF)
AFP Micrografx ABC FlowCharter Symbol Palette
AFT Micrografx ABC FlowCharter Template
af2 MicroGrafx ABC FlowCharter v2
af3 MicroGrafx ABC FlowCharter v3+
AFW Micrografx ABC FlowCharter Workspace
ASA Microsoft Active Server Application
ASD Microsoft Advanced Streaming Format (ASF) description file; opens with NSREX
AVI Microsoft Audio Video Interleaved file format for Windows movie
ASR Microsoft Automap Street Route
application Microsoft Clickonce Application [ms-clickonce] application/x-ms-application
AWP Microsoft Fax key viewer
AWD Microsoft Fax Viewer Document (which was originally called the "At Work Fax" Viewer). Raster image.
AVB Microsoft Internet Chat
ACP Microsoft Office 97 Actor Preview; see ACT
ACT Microsoft Office Assistant Actor file
ACP Microsoft Office Assistant Preview file
ATD Microsoft Systems Management Server SMSADDIN.EXE tool registration
APS Microsoft Visual C++ file
ASA Microsoft Visual InterDev file
ANN Microsoft Windows Help Annotation
ASF Microsoft-proprietary Advanced System Format. Can contain either (or both) audio and video, usually in non-Microsoft codecs.
APE Monkey's Audio file. A lossless compression of audio data. Details.
AAS Movie Clip; Autodesk Animation Setup; used by Compton's Reference Collection
AVI Movie Clip; Video Clip (Audio Video Interleave); see AAF, ASF (MIME: video/avi)
ans MS-DOS ANSI File
AOS Nokia 9000 Add-on
A Object code library
asa only global.asa
ADD OS/2 adapter drivers used in the boot process
ACV OS/2 drivers that compress and decompress audio data
ASC PGP armored encrypted file
ADI Picture, AutoCAD; see PLT
ACB Picture; ACMB
A11 Picture; AIIM
ASB Picture; Atari ST
ANM Picture; Deluxe Paint Animator; IFF file format
ALB Picture; JASC Image Commander
AAM Picture; Macromedia ShockWave
arc Pkarc Compressed File
APD Printer Driver; Adobe PageMaker
ASM Pro/E assembly file
ASP Procomm Plus setup and connection script
ACA Project Manager Workbench
ARJ Robert Jung ARJ compressed archive
ANT Sim-Ant
ANT SimAnt for Windows saved game file
ADR Smart Address address book
ABS Sometimes used to denote an abstract (as in an abstract or summary of a scientific paper) AutoBackup
AKAI Sound; Akai MIDI Digital Sampler
AM Sound; AM Module
AMD Sound; AMUSiC Tracker
AMM Sound; Audio Manager Module
ALAW Sound; Sun
AL Sound; Sun; same as ALAW
ADA Source Code; ADA programming language
APL Source Code; APL Programming Language
AWR Telsis file extension format for digitally stored audio.
ALF Text
ASC Text; ASCII Text
A3M unpackaged Authorware MacIntosh file
A4M unpackaged Authorware MacIntosh file
A4W unpackaged Authorware windows file
A3W unpackaged Authorware windows file
A5W unpackaged Authorware windows file
ART Used by AOL to designate files compressed using the Johson-Grace compreession algorithm
ADP Used by FaxWorks to do setup for fax modem interaction
AIS Velvet Studio Instruments
AMS Velvet Studio music module (MOD) file
ASE Velvet Studio sample
AVI Video clip
ASX Video file
AWM Video; Animation Works
AVI Videofiles
ADM Windows NT policy template
ACM Windows system directory file
ASD WinWord AutoSave
ART Xara Studio drawing