.??_ Files ending in "_" are often compressed install files of the same
name (e.g., .EX_ expands to .EXE, .DL_ expands to .DLL, etc.)
.A UNIX Library [UNIX]
ADA Program
.A01 ARJ Multi-volume Compressed Archive (can be 01 to 99) (also see .000)
.A01 - .A10 OzWin CompuServe E-mail/Forum Access SYSOP File
.A06 Lotto Pro 2002 Smart Number Ticket
.A11 AIIM Graphic
.A31 Authorware 3.x Library
.A3D Amapi 3D Modeling
.A3K Yamaha A3000 Sampler File
.A3L Authorware 3.x Library
.A3M Unpackaged Authorware MacIntosh File
.A3W Unpackaged Authorware Windows File
.A41 Authorware 4.x Library
.A4L Authorware 4.x Library
.A4M Unpackaged Authorware MacIntosh File
.A4P Authorware File Without Runtime
.A4W Unpackaged Authorware Windows File
.A51 Authorware 5.x Library
.A5L Authorware 5.x Library
.A5W Unpackaged Authorware Windows File
.A64 Artist 64 [XnView]
.A8 Cubicomp PictureMaker 24bit 3D Animation (DOS-based animation program; graphics cards external to computer; Cubicomp closed 1990)
.A86 A86 Assembler Program File
.AA Audio Book File
PROGNOSIS Automated Analyst Document File
.AAB Macromedia Authorware Binary
.AAC Advanced Audio Coding File
.AAM Authorware Shocked File
.AAO America's Army Map
.AAS Authorware Shocked Packet
.AAT Arcinfo Line Data Attribute Data (GIS-related file)
.AB Applix Builder File
.AB2 Parson's Address Book
.AB3 PhotoImpact Album File
.AB6 AB Stat Data
.AB8 AB Stat Data
.AB$ AutoCAD Spooled Plot File
.ABA Palm Address Book File
.ABC Flowchart
Musical Notation Language File (folk melodies originally)
.ABD AmBiz Bonus Calculator Data File
Adventure Builder Database
.ABF Adobe Binary Screen Font
.ABK Corel Draw AutoBackup
Any Automatic Backup
.ABL Maxagrid Avails Data File (text format)
.ABM HitPlayer Audio Album File
Photo Impressions 2000 Album
Album File (various)
.ABO Applix Builder Turbo File
.ABR Photoshop Brush
.ABS Abstracts
MPEG Audio Sound File [MPEG]
PC GNU Compiler Output
Abscissa Data File
Optocat [XnView]
.ABT The Arbiter Sports Official Schedule [Viewer]
.ABW AbiWord Document File
.ABX WordPerfect Address Book File
.ABZ AbszOrb (textured spinning orb creator)
.AC CaseWare Working Papers Client File
.AC_ CaseWare Working Papers Compressed Client File
.AC$ AutoCAD Undo Info
.AC3 AC3 Audio File Format [DVD Maestro, DVD Conductor]
.ACA MS Agent Character File
Project Manager Workbench File
.ACB ACBM Graphic Image
AOL Cab Launcher (archived data file)
.ACC DR-DOS Viewmax File
.ACD Chromeleon Channel Raw Data
Sonic Foundry Acid Music File
allCLEAR Flowcharting File
MS Agent Character Definiton File
.ACE The Ace Archiver Compressed File
Aces200 [XnView]
.ACF MS Agent Character File
Photoshop Custom Filter
.ACG MS Agent Preview File
.ACH Rockwell Software Logix 5 File
Speccy Snapshot
.ACI ACI Development Appraisal
.ACL Corel Draw 6 Keyboard Accelerator
MS Office AutoCorrect List
ACL For Windows (data mining software)
Access Control List
.ACM Audio Compression Manager Driver (Windows)
Photoshop Command Button
Windows System File
ACBM Image File
Interplay Compressed Sound File
.ACO Photoshop Color Swatch File
.ACP MS Office Assistant Preview File [Buy Office XP at Shop.Microsoft]
File Used by Adobe Acrobat Paper Capture
.ACQ AcqURL File (bookmark manager)
.ACR American College of Radiology File
Dicom [XnView]
.ACS MS Agent Character File
.ACT MS Office Actor Program File [Buy Office XP at Shop.Microsoft]
FoxPro Documenting Wizard Action Diagram
Photoshop Color Table
Action! Presentation
.ACU AppleLink-PE Compression Format (created by Floyd Zink; overtaken by Andy Nicholas' ShrinkIt; ShrinkIt should unpack)
COBOL Intermediate Object File
.ACV OS/2 Audio Drivers
Photoshop Saved Curve Also see
.ACW MS Accessibility Wizard Settings
.AD AfterDark Screen Saver
Ascend Password Protocol File
.AD! OzWin CompuServe E-mail/Forum Access QS-Special - Get Marked Online
.AD2 2-bit Compressed Voice File
.AD3 3-bit Compressed Voice File
.ADA ADA Program File
ActiveDocs Answer Set
.ADB ADA Package Body
HP Organizer Appointment Database
.ADC Chromeleon Demo Data File
ActiveDocs Clipping Catalog
Scanstudio 16-color Bitmap Graphic File
Lingvo Dictionary Text File
.ADD OS/2 Adapter Device Driver
Adobe Pagemaker File
Advantage Database Server Data Dictionary
.ADE MS Access Project Extension [Buy Office XP at Shop.Microsoft]
ADC Audio File
.ADF Adapter Description File
Admin Config File
Amiga Disk File (Uncompressed 901120 byte DD Diskimage) [Amiga Forever]
Dog Creek QC Mask File
.ADI AutoCAD Plotter File
Advantage Data Server Database Index File
.ADJ LISCAD Plus Adjustment File
.ADL QEMM MCA Adapter Description Library [MCA]
OzWin CompuServe E-mail/Forum Access QS-Special Get Marked
.ADM After Dark Screen Saver Module
Windows Policy Template
Addict Compiled Dictionary
Advantage Data Server Database Memo File
.ADN 1-2-3 Add-in Utility
MS Access Blank Project Template [Buy Office XP at Shop.Microsoft]
.ADO Photoshop Duotone Options
Stata Program
.ADP FaxWorks Modem Setup File
Astound Dynamite File
MS Access Project [Buy Office XP at Shop.Microsoft]
AOLserver Dynamic Page File [AOL]
.ADR After Dark Random Screen Saver Module
Address Plus Database
Smart Address Address Book
Address Book
Opera Web Browser Bookmark File
.ADS ADA Package Specification
.ADT HP NewWave Card Application Data File
Advantage Data Server Database File
Lingvo Dictionary File
AdTech Fax File
.ADV GUS Virtual Device Driver
.ADX Lotus Approach Index File
Archetype Designer Document
Dynazip Active Delivery Script
Sega Dreamcast Audio File [Source of files]
.ADZ GZ-Packed Amiga Disk File (see ADF) [Amiga Forever]
.AE SoftQuad Author/Editor File
.AEF ELECTRICAL Designer
.AEH iPer Advanced Embedded Hypertext
.AEP ArcExplorer Project File
.AER Adobe Atmosphere File [As of Mar 2002 in beta]
.AEU MS AutoRoute Express Europe Route
.AEX PGP Armored Extracted Public Encryption Key [PGP]
.AF2 ABC Flowchart (Now Micrografx FlowCharter)
.AF3 ABC Flowchart (Now Micrografx FlowCharter)
.AFC Apple Sound File
ArisFlow Commander File
.AFD ArisFlow Diagram
Prismo Graphics ActiveFile Data
.AFF AnyForm Form
.AFI Truevision Bitmap Graphic
.AFL Lotus Font
.AFM Outline Font Metric
HP NewWave Cardfile Application
LOUT File (High-Level Language For Document Formatting)
.AFP Flowchart Symbol Palette
Papyrus Document Storage Format
Prismo Graphics ActiveFile Proxy
IBM Transactional Data Format (Advanced Function Print) (AS400 computer)
.AFS Filter Factory Photoshop Filter [Added]
Sega Dreamcast Compressed Audio
.AFT Flowchart Template
AnyForm Template
.AFW Flowchart Work Area
.AFX Auto FX Photographic Edges (Photoshop add-in)
.AG Applix Graphic
Argus Spreadsheet File
.AG4 Access G4 File [Buy Office XP at Shop.Microsoft]
.AGF Atlas GeoFile
.AGP Aspen Graphics Pages
.AGW Aspen Graphics Windows
.AHQ AudioHQ Plugin Module
.AHS Photoshop Halftone Screens
.AI Adobe Illustrator Vector Graphic [XnView]
Corel Trace Drawing
Progress Database After Image File
Advantage Database Server File
EARS Component File (EARS = UK Liberal Democrats Election Agents Record System) [Filename starts with E]
.AIF Knowledgeware Setup Information
Audio Interchange File [IrfanView]
SymbianOS Application Information File (set application properties)
.AIFC Audio Interchange File [IrfanView]
.AIFF Audio Interchange File [IrfanView]
.AIH ArcView Optional Index File (GIS-related file)
.AIJ Oracle After-Image Journal
.AIL AutoImager File (batch image conversion)
.AIM AOL Instant Messenger File [AOL]
.AIML Artificial Intelligence Markup Language
.AIN AIN Compressed Archive
ArcView Optional Index File (GIS-related file)
.AINSO VAX CRYSTALS Chemical Crystallogaphy File
.AIO APL File Transfer Format
.AIP Audiosoft Parameter File
.AIQ AzureIQ Client File (IT Audit Reporting)
.AIR Align It! Resource File
Flight Simulator Aircraft Performance Info File [Free Flight Dynamic Editor]
.AIS Array of Intensity Samples (Graphic)
Velvet Studio Instruments
ACDSee Image Sequence File
.AIX HP NewWave Cardfile Application Data
.AKF Acrobat Key File
.AKW RoboHELP Help Project Index File
.AL Oracle File (used for networking)
.ALA Alan Adventure Language File
Sharp Fax File (unverified)
.ALB JASC Image Commander Album
Steinberg Cubase or VST Backup Song File
Photo Soap2 File
.ALBM webAlbum Photo Album
HP Photosmart Photo Printing Album
.ALC Norton Internet Security Ad Server File
MP3 Embedded Dynamic Lyrics
.ALE Avid Log Exchange
.ALF Abacus Law File
ALF Logic File ("Another logical framework"--structure editor for Martin-Löf's monomorphic type theory)
AdventNet Look and Feel Standards (ALFSTANDARDS.ALF)
Aventail Connect License File (AVENTAIL.ALF)
VPCom Remote User Configuration File
LANDesk Client Manager Configuration File
ACT! User Logon Tracking
Color Quick Label
Cadence Ambit BuildGates
.ALI SAP Proprietary Format Document File
OM2 OMALI Native OMALI Document
.ALIAS Alias Image [XnView]
.ALL Arts & Letters Symbols and Characters
WordPerfect Printer Info
Steinberg Cubase or VST Song File
Always Working Page Format File
.ALS Alias Image [XnView]
Calmira Shortcut File
.ALT WordPerfect Menu File
.ALV Photoshop Levels
Aladdin Knowledge Systems Vbox Available Languages File (software distribution)
.ALX OM2 OMALI Plug-in Extension
.ALZ ALZip Compressed File (Korean site)
.AM Applix SHELF Macro
Advantage Database Server File
.AM2 AutoPlay Menu Studio Version 2
.AM3 AutoPlay Menu Studio Version 3
.AMB Radiance Ambient File Format
.AMC Ant Movie Catalog
.AMF Advanced Module Format Music File
DSMIA/Asylum Module Music
.AMG AMGC Compressed Archive (alternate site)
AMG ACTOR System Image
.AMI Cocreate SolidDesigner Annotation File
Amiga Paint [XnView]
.AML AutoMage (Automation/Macro Software)
.AMM AMM File (pattern design pgm for Universal flat knitting machines)
.AMP Photoshop Arbitrary Map Settings
.AMS Extreme's Tracker Module Format
Photoshop Monitor Setup
Velvet Studio Module
.AMZ The Amazon Trail Saved Game
.AN Groundworks Text File
.AN8 Anim8or 3D Animation
.ANC Canon Computer Pattern Maker File
.ANF AcuteNotes File (contains one or several notes order in a hierarchy)
.ANI Animated Cursor Microangelo [IrfanView]
.ANL Project Analyzer Saved Analysis
.ANM DeluxPaint Animation
.ANN Help Annotation
.ANO Annotation File (often used with annotating PDF files)
.ANS ANSI Graphic [ANSI]
MS Word Text and Layout [Buy Office XP at Shop.Microsoft]
.ANSR AnswerTool File
.ANT SimAnt for Windows Saved Game File
.ANV AirNav [XnView]
.AOB DVD Audio File (MPEG-2 program streams with additional info)
.AOF Acorn Object Format (used for data storage)
.AOS Nokia Add-on Software
.AOT ZenWorks Application Binary Object Template File
.AP Applix Presents File
Datalex EntryPoint 90 Data File
WHAP-Compressed Amiga Archive
.APA AlfaPad Organizer File
ArcPad 6 Applet
.APC Lotus Printer Driver Characters
Centura Team Developer Compiled Application File
.APD Lotus Printer Driver
Centura Team Developer Dynamic Application Library File
.APE Music Format [Many different players]
.APF Lotus Printer Driver Fonts
ArcPad 5 Profile
Acrobat Profile File
Homesite Project File
Fax2000 File
.API Lotus Printer Driver Info
Photoshop Ink Colors Setup
Application Program Interface
Acrobat Plug-in
1st Reader Passed Parameter File
.APIN Adobe InDesign Import/Export Filter
.APJ Angel Debug Monitor Project File (link is PDF file)
Music Screen Saver File (usually associated with .SCR file)
ARM Project Manager File
.APK GameSpy Arcade Service
.APL Centura Team Developer Application Library File
ArcPad 6 Layer
APL Workspace File
.APM ArcPad 6 File
.APO Apollo Scripts
.APP R:Base, Symphony, DR-DOS, FoxPro (or other) Application
Centura Team Developer Normal Mode Application File
dBASE Application Object File
ArcPad 5 Project
SymbianOS Application
CLARION for Windows Application
Executable Application (under DR-DOS, NeXTstep, Atari)
.APR Lotus Approach 97 File
ArcView Project File (GIS-related file)
Employee Appraiser Performance Review File
.APS MS Visual C++ File
ArcPad 5 Symbology File
Advanced Patching Systems with Error Checking
.APT Centura Team Developer Text Mode Application File
Lotus Approach Data View File
Nimbus 7 SAMS Data File (a-priori temperature profiles)
.APX Lotus Approach Paradox-specific Information File
Borland C++ Appexpert Database
ArcPad 6 XML File
Ability Photopaint Image [XnView]
.AQ Applix Data
.AR Compressed Archive File (used by MS Midtown Madness 1 & 2 games)
Midtown Madness City Add-on
.ARA ATI Radeon Video Driver File
.ARC Archive File
.ARCHIMEDES Speccy Snapshot
.ARF Automatic Response File
.ARH ArHymo Hydrologic Simulation ()
.ARI Aristotle Audio File
Compressed Archive
.ARJ Compressed Archive (Stuffit can expand)
.ARK Compressed Archive
.ARL AOL Organizer File [AOL]
.ARM Armadillo Software Protection System
.ARN Astronomical Research Network [XnView]
.ARPX8 Techno Toys Arp-X8 MIDI Arpeggiator File
.ARQ Compressed Archive (often on a Macintosh)
.ARR Atari Cubase Arrangement
.ARS Artifax Report Editor (SQL query tool)
.ART Clip Art File
Xara Studio Drawing
Blood Archive [Dragon UnPACKer]
Duke Nukem 3D Archive [Dragon UnPACKer]
Canon Crayola Art File
Another Ray Tracer Format
AOL Johnson-Grace Compressed File [AOL]
First Publisher Raster Graphic
PFS: Art Publisher [XnView]
Art Director Image [XnView]
Artisan [XnView]
.ARV Arsiv File
AutoRoute User Information
.ARX Compressed Archive
.ARY Compaq SmartStart Scripting Toolkit File
.AS Applix Spreadsheet
Macromedia Flash Action Script (include files when writing large scripts)
.AS3 Alternate Sources Data File [Warning: Link goes to a sexually-oriented site.]
APL*PLUS II/386 and III/Windows Source Code
.AS4 AS/400 Client Access
.ASA MS Visual InterDev File
Active Server Document
.ASC ASCII Text File [ASCII]
PGP Armored Encrypted File [PGP]
.ASCX Web User Control (part of MS .NET)
.ASD MS Word Automatic Backup [Buy Office XP at Shop.Microsoft]
Lotus Screen Driver
MS Advanced Streaming Format Description File
Astound Presentation
.ASE Velvet Studio Sample
.ASF MS Active Streaming (Media) File (contains audio and/or video compressed with 3rd party codecs)
Statgraphics Data
Lotus Screen Font
APL*Plus/PC APL Shared File
Electronic Arts Music File
.ASH TASM Assembler Header
.ASI Borland Assembler Include
.ASK askSam Database
.ASM Assembler Source Language (various)
Pro/Engineer Assembly File
.ASMX ASP.NET Webservices Source File
.ASO Assembler Object
Astound Dynamite Objects
.ASP Active Server Page
Procomm Plus ASPECT Program
Astound Presentation File
Photoshop Photo File Index
Photoshop Separation Setup
EROSION 3D Aspect File [Format (pdf)]
.ASPI Audio Catalyst
.ASPX ASP.NET Source File
.ASR Ms Automap Route
Photoshop Scratch Area
.ASS Assembler/Disassembler 68HC11 File
ASS I/O (programmers utility to pack multiple files into one file)
.AST Astound Multimedia File
Photoshop Separation Tables
Claris Works Assistant File
.ASV DataCAD Autosave File
Photoshop Selective Color
.ASX Metafile (points to an .ASF structured file)
Cheyenne Backup Script
Video File
.AT2 Aldus Persuasion 2.0 Auto Template
DCX-AT200 Motion Control Command Language File
.AT3 DCX-AT3000 Motion Control Command Language File
.ATF Photoshop Transfer Function
.ATK Bitmap Image (Andrew Toolkit Raster Object file) [XnView]
.ATL Hal/Supernova/Lunar/LunarPlus Screen Readers/Magnifiers
PROGNOSIS Atlas Document File
.ATM Adobe Type Manager Data File
.ATN Adobe Photoshop Action File
.ATO Just Burn File (audio CD burner on Compaq computers)
.ATR Lightscape Material Library
.ATS Attityd Swedish Survey Program
.ATT AT&T Group 4 Bitmap (fax) [XnView]
.ATW AnyTime Deluxe PIM File [PIM]
Attityd Swedish Survey Program
.ATX A ZIP-formatted Compressed Archive (Use any ZIP program to open)
.AU Music File (various, usually Sun or UNIX) [IrfanView] [Linux Player]
.AUD Audio File used by Westwood Studios for various games
.AUP ePocrates File
.AUT AutoIt Script (automate any windows based task)
PocketWear Car Lease Kit Vehicle Data File (Pocket PC)
TLG Workplace CD Search File
Xitami Webserver Admin Password File (default.aut)
GPSMan-autoMapic File (moving-map real-time plotting)
Signwave Auto-Illustrator File
Descent Manager Mission File
Authentication File (various)
Interactive Pictures iPIX Format
.AUX TeX/LaTeX Auxilliary Reference File
ChiWriter Auxilliary Dictionary File
.AV Final Draft AV Document File
.AVA Avagio Publication
.AVB Inoculan Anti-Virus Virus Infected File
Avid Bins File
Microsoft Chat Character File
.AVC Kaspersky Antivirus Toolkit File
.AVD Avery Label Pro Data File
.AVI Audio Video Interleave File [IrfanView]
.AVL ArcView Theme Legend File (GIS-related file)
.AVP ArcView Pallet File (GIS-related file)
Avid Project File
.AVR Audio Visual Research Sound File
.AVS Animation File
Application Visualization System Format
Stardent AVS X Image [XnView]
Winamp Advanced Visualization Studio File
Avid Settings File
.AVX ArcView File (GIS-related file)
Avid Extensions File
.AW HP AdvanceWrite Text File
MS Answer Wizard File
Applix Word File
.AWB Lavasoft Ad-aware Backup File
.AWD Faxviewer Document (AWD Microsoft Fax) [PolyView Viewer]
Award BIOS File
AWK Language Source Code File
.AWE Adobe Acrobat Bookmark XML File
.AWF Qui veut gagner des millions Archive [Dragon UnPACKer]
Who wants to be a millionaire Archive [Dragon UnPACKer]
.AWK AWK Script
.AWM Animation Works Movie
.AWR Telsis Digital Audio File
.AWS StatGraphics Data File
.AWX MS DirectX 8.1
.AX DirectShow Filter
DivX MPEG-4 DVD Filter [some filters work with Windows Media Player]
.AXD Avery Label Pro Re-Index File
.AXE Paradigm C++ Integrated Debugger File
ChordMaster (Chord Chemistry and Sequencing program for guitarists)
MS Autoroute Export File
.AXG MS Autoroute Trip File
.AXL ArcIMS XML Project File [XML]
.AXP GraphStore eCADLite File
.AXR Telsis Digital Audio File
ElcomSoft Advanced Archive Password Recovery
.AXS MindAvenue AXEL Stream File
.AXT ZenWorks snAPPshot ASCII Application Object Template
Photoshop Replace Color/Color Range
.AY AY Chip Sound File (chip used in ZX spectrum and other arcade machines)
.AZ WinDVD File
.AZZ AZZ Cardfile Personal Information Manager
