letter A extensions

.A UNIX Library [UNIX] ADA Program
.A01 ARJ Multi-volume Compressed Archive (can be 01 to 99)
.A11 Graphic
.A3K Yamaha A3000 Sampler File
.A3L Authorware 3.x Library
.A3M Unpackaged Authorware MacIntosh File
.A3W Unpackaged Authorware Windows File
.A4L Authorware 4.x Library
.A4M Unpackaged Authorware MacIntosh File
.A4P Authorware File Without Runtime
.A4W Unpackaged Authorware Windows File
.A5L Authorware 5.x Library
.A5W Unpackaged Authorware Windows File
.A86 A86 Assembler Program File
.A_T A-Train
.AA Audio Book File
.AAM Authorware Shocked File
.AAS Authorware Shocked Packet
.AB Applix Builder File
.AB6 AB Stat Data
.AB8 AB Stat Data
.AB$ AutoCAD Spooled Plot File
.ABC Flowchart
.ABD AmBiz Bonus Calculator Data File
.ABF Adobe Binary Screen Font
.ABK Corel Draw AutoBackup Any Automatic Backup
.ABM HitPlayer Audio Album File 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
.ABW AbiWord Document File
.ACA MS Agent Character File Project Manager Workbench File
.ACB ACBM Graphic Image Archived Data File
.ACC DR-DOS Viewmax File
.ACD Chromeleon Channel Raw Data Sonic Foundry Acid Music File MS Agent Character Definiton File
.ACE The Ace Archiver Compressed File
.ACF MS Agent Character File Photoshop Custom Filter
.ACG MS Agent Preview File
.ACH Rockwell Software Logix 5 File
.ACI ACI Development Appraisal
.ACL Corel Draw 6 Keyboard Accelerator
.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 File Used by Adobe Acrobat Paper Capture
.ACR American College of Radiology File
.ACS MS Agent Character File
.ACT MS Office Actor Program File FoxPro Documenting Wizard Action Diagram Photoshop Color Table
.ACV OS/2 Audio Drivers Photoshop Saved Curve Also see
.AD AfterDark Screen Saver
.AD2 2-bit Compressed Voice File
.AD3 3-bit Compressed Voice File
.ADA ADA Program File
.ADB ADA Package Body HP Organizer Appointment Database
.ADC Chromeleon Demo Data File Scanstudio 16-color Bitmap Graphic File Lingvo Dictionary Text File
.ADD OS/2 Adapter Device Driver Adobe Pagemaker File
.ADE MS Access Project Extension ADC Audio File
.ADF Adapter Description File Admin Config File Amiga Disk File (Uncompressed 901120 byte DD Diskimage)
.ADI AutoCAD Plotter File
.ADL QEMM MCA Adapter Description Library [MCA]
.ADM After Dark Screen Saver Module Windows NT Policy Template Addict Compiled Dictionary
.ADN 1-2-3 Add In Utility MS Access Blank Project Template
.ADO Photoshop Duotone Options
.ADP FaxWorks Modem Setup File Astound Dynamite File MS Access Project AOLserver Dynamic Page File [AOL]
.ADR After Dark Random Screen Saver Module Smart Address Address Book
.ADS ADA Package Specification
.ADT HP NewWave Card Application Data File Lingvo Dictionary File AdTech Fax File
.ADV GUS Virtual Device Driver
.ADX Lotus Approach Index File Archetype Designer Document Dynazip Active Delivery Script
.ADZ GZ-Packed Amiga Disk File (see ADF)
.AE SoftQuad Author/Editor File
.AEH iPer Advanced Embedded Hypertext
.AEP ArcExplorer Project File
.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
.AFI Truevision Bitmap Graphic
.AFL Lotus Font
.AFM Outline Font Metric HP NewWave Cardfile Application
.AFP Flowchart Symbol Palette
.AFS Filter Factory Photoshop Filter [Added]
.AFT Flowchart Template
.AFW Flowchart Work Area
.AG Applix Graphic
.AG4 Access G4 File
.AGP Aspen Graphics Pages
.AGW Aspen Graphics Windows
.AHS Photoshop Halftone Screens
.AI Adobe Illustrator Vector Graphic Corel Trace Drawing Progress Database After Image File
.AIF Knowledgeware Setup Information Audio Interchange File [Viewer]
.AIM AOL Instant Messenger File [AOL]
.AIN AIN Compressed Archive
.AIO APL File Transfer Format
.AIP Audiosoft Parameter File
.AIR Align It! Resource File
.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
.ALB JASC Image Commander Album Steinberg Cubase or VST Backup Song File
.ALC Norton Internet Security Ad Server File
.ALI SAP Proprietary Format Document File
.ALL Arts & Letters Symbols and Characters WordPerfect Printer Info Steinberg Cubase or VST Song File
.ALS Alias Image
.ALT WordPerfect Menu File
.ALV Photoshop Levels
.AM Applix SHELF Macro
.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
.AMP Photoshop Arbitrary Map Settings
.AMS Extreme's Tracker Module Format Photoshop Monitor Setup Velvet Studio Module
.AN Groundworks Text File
.ANC Canon Computer Pattern Maker File
.ANI Animated Cursor [Viewer]
.ANL Project Analyzer Saved Analysis
.ANM DeluxPaint Animation
.ANN Help Annotation
.ANS ANSI Graphic [ANSI] MS Word Text and Layout
.ANT SimAnt for Windows Saved Game File
.AOF Acorn Object Format (used for data storage)
.AOS Nokia Add-on Software
.AOT ZenWorks Application Binary Object Template File
.AP Applix Presents File WHAP-Compressed Amiga Archive
.APA AlfaPad Organizer File
.APC Lotus Printer Driver Characters Centura Team Developer Compiled Application File
.APD Lotus Printer Driver Centura Team Developer Dynamic Application Library File
.APF Lotus Printer Driver Fonts Acrobat Profile File Homesite Project File
.API Lotus Printer Driver Info Photoshop Ink Colors Setup Application Program Interface
.APK GameSpy Arcade Service
.APL Centura Team Developer Application Library File APL Workspace File
.APP R:Base, Symphony, DR-DOS, FoxPro (or other) Application Centura Team Developer Normal Mode Application File
.APR Lotus Approach 97 File ArcView Project File Employee Appraiser Performance Review File
.APS MS Visual C++ File Advanced Patching Systems with Error Checking
.APT Centura Team Developer Text Mode Application File Lotus Approach Data View File
.APX Lotus Approach Paradox-specific Information File Borland C++ Appexpert Database
.AQ Applix Data
.ARC Archive File Compressed File
.ARF Automatic Response File
.ARI Aristotle Audio File Compressed Archive
.ARJ Compressed Archive
.ARK Compressed Archive
.ARL AOL Organizer File [AOL]
.ARM Armadillo Software Protection System
.ARR Atari Cubase Arrangement
.ART Clip Art File Xara Studio Drawing Canon Crayola Art File Another Ray Tracer Format AOL Johnson-Grace Compressed File [AOL] First Publisher Raster Graphic
.ARX Compressed Archive
.AS Applix Spreadsheet
.ASA MS Visual InterDev File Active Server Document
.ASC ASCII Text File [ASCII] PGP Armored Encrypted File [PGP]
.ASD MS Word Automatic Backup Lotus Screen Driver MS Advanced Streaming Format Description File
.ASE Velvet Studio Sample
.ASF MS Active Streaming (Media) File 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)
.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
.ASPX ASP.NET Source File
.ASR Ms Automap Route Photoshop Scratch Area
.AST Astound Multimedia File Photoshop Separation Tables Claris Works Assistant File
.ASV DataCAD Autosave File Photoshop Selective Color
.ASX MS Windows Media Active Stream Redirector File Cheyenne Backup Script Video File
.AT2 Aldus Persuasion 2.0 Auto Template
.ATF Photoshop Transfer Function
.ATM Adobe Type Manager Data File
.ATR Lightscape Material Library
.ATT AT&T Group 4 Bitmap (fax)
.ATW AnyTime Deluxe PIM File [PIM]
.AU Music File (various) [Viewer]
.AUD Audio File used by Westwood Studios for various games
.AUX TeX/LaTeX Auxilliary Reference File ChiWriter Auxilliary Dictionary File
.AVA Avagio Publication
.AVB Inculan Anti-Virus Virus Infected File Microsoft Chat Character File
.AVI Audio Video Interleave File [Viewer]
.AVR Audio Visual Research Sound File
.AVS Animation File Application Visualization System Format Stardent AVS-X Image Winamp Advanced Visualization Studio File
.AVX ArcView File
.AW HP AdvanceWrite Text File Applix Word File
.AWD Faxviewer Document
.AWK AWK Script
.AWM Animation Works Movie
.AWR Telsis Digital Audio File
.AWS StatGraphics Data File
.AXL ArcIMS XML Project File [XML]
.AXR Telsis Digital Audio File
.AXT ASCII Application Object Template Photoshop Replace Color/Color Range