ABK Corel Draw AutoBackup

ACL Corel Draw 6 keyboard accelerator

ACM Used by Windows in the system directory

ACP Microsoft Office Assistant Preview file

ACT Microsoft Office Assistant Actor file

ACV OS/2 drivers that compress and decompress audio data

AD After Dark screensaver

ADB Appointment database used by HP 100LX organizer

ADD OS/2 adapter drivers used in the boot process

ADM After Dark MultiModule screensaver

ADP Used by FaxWorks to do setup for fax modem interaction

ADR After Dark Randomizer screensaver

AFM Adobe font metrics

AF2 ABC Flowchart file

AF3 ABC Flowchart file

AI Adobe Illustrator drawing

AIF Apple Mac AIFF sound

ALB JASC Image Commander album

ALL Arts & Letters Library

AMS Velvert Studio music module (MOD) file

ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors

ANI Animated Cursor

ANS ANSI text

API Application Program Interface file; used by Adobe Acrobat

APR Lotus Approach 97 file

APS Microsoft Visual C++ file

ARC LH ARC (old version) compressed archive

ARJ Robert Jung ARJ compressed archive

ART Xara Studio drawing

ART Canon Crayola art file

ASA Microsoft Visual InterDev file

ASC ASCII text

ASD WinWord AutoSave

ASM Assembler language source file

ASP Active Server Page (an HTML file containing a Microsoft server-processed script)

ASP Procomm Plus setup and connection script

AST Claris Works "assistant" file

ATT AT&T Group 4 bitmap

AVI Microsoft Video for Windows movie

AWD FaxView document