A (FILE EXTENSIONS BEGINS WITH - ALPHABET A), FILE EXTENSIONS START WITH 'A'

FILE EXTENSIONS START WITH - ALPHABET - 'A'

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A
Ext.	Description	Used by
A	ADA source code file
A	Library	Unix
A##	AlZip Compressed Files' pieces
A11	Graphics AIIM image file
A80	Assembler language source for 8080
AA, AB, ...	Split parts of a single whole file	split (Unix)
AAC	Advanced Audio Coding is a standardized, lossy compression and encoding scheme for digital audio.
AAF	Auto Patcher file
AAF	Advanced Authoring Format is an advanced media wrapper file for professional applications.
AAS	Animation Play Script	AAPlay
AB6	Data file	ABStat
AB8	Data file	ABStat
ABC	Document	ABC FlowCharter 1.0
ABP	Data	ABComp compressed
ABP	AVS Barcode Profile	AVS Barcode Source
ABF	Adobe Binary Screen Font	Adobe Systems Software
ABK	Automatic backup file	CorelDRAW
ABM	Image PALS album file
ABM	Album file (various programs)
ABR	Adobe Brush file for PhotoShop	PhotoShop
ABS	Abstracts (info file)
ABS	Data file	Abscissa
AC	Project backup	Audit Command Language (ACL)
ACA	Project	Project Manager Workbench
ACB	Archive	ACB
ACB	see ACMB
ACC	Program (DR-DOS - ViewMax)	GEM / resident
ACCDA	Data	Microsoft Access Database Wizard (Open XML)
ACCDB	Data	Microsoft Access Database (Open XML)
ACCDE	Data	Microsoft Access Database Wizard (Open XML)
ACCDT	Data	Microsoft Access Database Template (Open XML)
ACCDU	Data	Microsoft Access Database Wizard (Open XML)
ACE	Archive	ACE
ACF	Adobe Custom Filter for PhotoShop	PhotoShop
ACL	Project	Audit Command Language (ACL)
ACL	AutoCorrect List	Microsoft Office
ACM	Audio Compression Module add-on	Win
ACMB	Graphics file
ACO	Adobe Color Palette
ACT	ACTOR source code file	ACTOR
ACT	Animations Works Actor (Graphics cell)	Animation Works
ACT	FoxDoc Action Diagrams	FoxPro[disambiguation needed]
ACT	Presentation	Action!
AD	AfterDark screensaver module	AfterDark
AD2	ADPCM 2-bit compressed voice file	ZFAX
AD3	ADPCM 3-bit compressed voice file	ZFAX
ADA	Ada source code file
ADB	Ada Package Body
ADC	Bitmap graphics (16 colors)	Scanstudio
ADC	Dictionary	Lingvo
ADD	OS/2 adapter device driver
ADF	Amiga Disk File	unADF, UAE, WinUAE etc...
ADG	Data	ADG 3D Scene
ADI	Graphics file	AutoCAD
ADI	Database Index File	Advantage Database Server
ADICHT	LabChart data acquisition file	ADInstruments
ADL	MCA adapter description library	QEMM
ADM	After Dark support file	AfterDark
ADM	ADEM file format	ADEM
ADI	Database Memo File	Advantage Database Server
ADN	Add-in	Lotus 1-2-3
ADR	After Dark support file	AfterDark
ADS	Ada Package Specification
ADT	WoW geographical map location file	Blizzard Entertainment games (various)
ADT	Data file for card file application	HP NewWave
ADT	Dictionary	Lingvo
ADT	Fax	AdTech
ADI	Database Table	Advantage Database Server
ADV	GUS device driver	Gf166.com
ADX	Document	Archetype Designer
ADZ	Amiga Disk Zipped (See Amiga Disk File)	GZip
AEP	After Effects Project File	Adobe After Effects
AF2	Flowchart	ABC FlowCharter 2.0
AF3	Flowchart	ABC FlowCharter 3.0
AFI	Truevision bitmap graphics
AFL	Font file (for Always)	Lotus 1-2-3
AFM	Data file for card file application	HP NewWave
AFM	Type 1 font metric ASCII data for font installer	ATM - many
AFP	Shape palette	ABC FlowCharter
AFT	Template	ABC FlowCharter 3.0
AFW	Workplace	ABC FlowCharter 3.0
AGR	ArcView ASCII grid
AHK	AutoHotkey script file	AutoHotkey
AI	Vector graphics file	Adobe Illustrator
AIF	see AIFF
AIFC	Audio Interchange File Format with Compression
AIFF	Audio Interchange File Format	Convert (c) Villena
AiM	Asm Text Mode Image File	The Ultimate Draw
AIN	Archive	AIN
AIN	Job schedule	AutoIntern
AIO	APL programming language file transfer format file
AIR	Adobe AIR installation package	The Adobe AIR runtime environment.
AIS	Array of Intensity Samples graphics file	Xerox
AIX	Data file for card file application	HP NewWave
AKM	"Akai Multitimbral" sample information file	Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
AKP	"Akai Program" sample information file	Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
ALC	Molecular coordinates	Alchemy, RasMol
ALG	Activity Log	ARCSOLO
ALE	Avid Log Exchange (used in film & video editing)	Avid
ALL	Arts & Letters symbol and font files	Arts & Letters
ALL	Filelist w/ all files	FRQView
ALL	Format file for working pages	Always
ALL	General printer information	WordPerfect for Win
ALO	Almanac support file
ALT	Menu file	WordPerfect Library
ALZ	AlZip Compressed Files
AMD	Maxum chromatograph offline database	Siemens Maxum Chromatograph
AMF	Music (Advanced Module Format)	DMP
AMG	Archive	AMGC
AMG	System image file	ACTOR
AML	AutomationML	AutomationML Group
AMR	Audio format for mobile phones (Nokia, SonyEricsson)
AMS	Adobe Monitor Setup calibration file	PhotoShop
AMS	Music format
ANA	Lumina Decision Systems Analytica file
ANI	Animation cursors for Win	Win95 - WinNT
ANI	Animation	IconAuthor
ANM	Animation	Deluxe Paint Animator
ANN	Help Annotations	Windows 3.x
Ann	Multi volume ARJ archive	ARJ
ANS	ANSI character graphics (animation) file	ANSView
ANS	ASCII text ANSI character set	NewWave Write
AOL	America On-line for Windows DLL	Win
AOS	Add-On Software	Nokia 9000
AP	Archive	WHAP
AP	Datafile	Datalex EntryPoint 90
APC	Printer driver	Lotus 1-2-3
APD	Printer driver	Lotus 1-2-3
APE	Monkey's Audio (Lossless)	audio media players
APF	Printer driver	Lotus 1-2-3
API	Adobe Printer Ink file for PhotoShop	PhotoShop
API	Passed parameter file	1st Reader
API	Printer driver	Lotus 1-2-3
APL	APL work space format file
APL	Support module used by Manugraphics APL products
APL	EV-Dos Application File
APM	Authorware Macintosh	Authorware
APP	Add-in application file	Symphony
APP	Application object file	dBASE Application Generator
APP	Application	FoxPro
APP	Application and Application Bundle	Mac OS X
APP	Executable workflow / macro file	Automator
APP	Executable application file	DR-DOS - NeXTstep - Atari
APP	Generated application	FoxPro
APR	Employee performance review	Employee Appraiser
APW	Authorware Windows	Authorware
APX	Appexpert database file	Borland C++ 4.5
AR	Argon - for 3D Modeling	Ashlar-Vellum
AR7	Archive	AR7
ARC	Archive	ARC - PKARC/PKXARC - PKPAS - PKUNPAK - QUARK
ARC	Archive	SQUASH
ARD	Map	Holux - Alan
ARF	Automatic Response File
ARH	Archivers definitions file	DN
ARI	Archive	ARI
ARJ	Archive	ARJ - ARJZ
ARK	ARC archive	CP/M port of ARC file archiver
ARK	Archive	QUARK
ARK	Managing your Money Archive File
ARR	Arrangement	Atari Cubase
ART	Gerber artwork	Cadence Allegro
ART	First Publisher, Designworks, Greenstreet Draw graphic file	All GST/Greenstreet Draw products
ART	Graphics (scrapbook)	Art Import
ART	Graphics format (Another Ray Tracer)	PFS:1st publisher - Art Import
ARTX	file format	Artisteer
ARTX	file format	belightsoft Text Art
ARX	Archive	ARX
ASC	ASCII text file
ASC	Transport armor file	PGP
ASD	Autosave file	Microsoft Word
ASD	Presentation	Astound
ASD	Screen driver	Lotus 1-2-3
ASD	Spectral Data Set	ASD Inc. RS3 spectral acquisition program
ASE	Velvet Studio Sample	AWAVE
ASE	ASCII Scene Export	3D Studio
ASF	Datafile	STATGRAPHICS
ASF	Screen font	Lotus 1-2-3
ASF	Advanced Streaming Format (Compressed Windows audio/video)	Microsoft Corporation
ASK	SYSGEN answer file	RT-11
ASH	Assembly language header file	TASM 3.0
ASI	ASIC language source	ASIC
ASI	Assembler include file	Turbo C - Borland C++
ASM	Assembler language source	TASM, MASM, NASM, Yasm, FASM
ASMX	ASP.NET Web Service	Microsoft Corporation
ASO	Assembler object (object-oriented) file	Turbo Assembler
ASP	ASPECT source code file	Procomm Plus
ASP	Association of Shareware Professionals OMBUDSMN.ASP notice
ASP	Active Server Pages of Microsoft.Net	Microsoft Corporation
ASPX	ActiveX Server Pages of Microsoft.Net	Microsoft Corporation
ASS	Amalgam Scene Specification	Halo 2 Map Editor
ASS	Advanced SubStation Alpha (Subtitles)
AST	Adobe Color Separation table for PhotoShop	PhotoShop
ASV	Autosave File	MATLAB
ASW	Authorware Star	Authorware
ASX	Advanced Stream Redirector file, redirects to an ASF file (see ASF)	Microsoft Corporation
ASZ	Skin	AltDesk
AT2	Auto template	Aldus Persuasion 2.0
AT3	Atrac 3 Sound/music file	All Sony devices and programs with the Atrac 3+ specification
ATM	Adobe Type Manager data/info
ATN	Adobe Photoshop action	Adobe Photoshop
ATT	AT&T Group	GCGW
ATY	Produced when an association type is exported by 3D Topicscape	3D Topicscape
AU	Sun/NeXT/DEC Audio file	AWAVE, GoldWave
AU	Sound (audio) file	Sun Microsystems - Convert (c) Villena
AUD	Audio file	AudioRack
AUP	Audacity project file	Audacity
AUX	Auxiliary dictionary	ChiWriter
AUX	Auxiliary references	TeX/LaTeX
AUZ	Ableton Live File	Authorization File for Ableton Live
AVA	Publication	Avagio
AVB	AntiViral Toolkit Pro Bases
AVI	Audio Video Interleaved animation file	Video for Windows
AVR	Audio Visual Research	AWAVE
AVS	Audio Video Software	AVS Video Editor (video editing software)
AVT	AVATAR-coding files	A3E
AW	Text file	HP AdvanceWrite
AWA	Animations Works Accelerated Movie	Animation Works
AWD	Microsoft Fax At Work Document	Microsoft Fax At Work
AWK	AWK script/program
AWM	Animations Works Movie (as .AVI)	Animation Works
AWS	Data	STATGRAPHICS
Ax	Directshow filter file format
AXF	ARM Executable Image generated by the ARM tools.
AXM	Axmedis object	Axmedis Tools
AZD	Amazon Software Download	Amazon Software Download
AZW	DRM enabled eBook	All models of Amazon Kindle
AZW1	DRM enabled eBook with embedded fonts	All models Amazon Kindle
AZW2	Program file	All models of Amazon Kindle excluding Kindle 1
AZZ	Data file	AZZ Cardfile