A B CD E F G H I J K LM N OP Q R S T U V W XY Z No#
| 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 |
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| BAK | Backup file |
| BAS | BASIC code |
| BAT | Batch file |
| BFC | Windows 95 Briefcase document |
| BG | Backgammon for Windows game |
| BI | Binary file |
| BIF | GroupWise initialization file |
| BIN | Binary file |
| BK | Sometimes used to denote backup versions |
| BK$ | Also sometimes used to denote backup versions |
| BKS | An IBM BookManager Read bookshelf |
| BMK | An A bookmark file |
| BMP | Windows or OS/2 bitmap |
| BM1 | Apogee BioMenace data file |
| BRX | A file for browsing an index of multimedia options |
| BSP | Quake map |
| BS1 | Apogee Blake Stone data file |
| BTM | Batch file used by Norton Utilities |
| B4 | Helix Nuts and Bolts file |