| Abbreviation | Definition |
|---|---|
| AVS | AVS X image file Bitmap graphics |
| AVT | Avatar A3E coding file |
| AW | HP AdvanceWrite Text document |
| AWA | Animation Works Accelerated movie |
| AWD | At Work Document |
| AWD | FaxView - Microsoft Fax At Work Document file |
| AWE | Address Windowing Extension |
| AWK | AWK language source code file |
| AWM | Animations Works Movie |
| AWS | STATGRAPHICS Data |
| AWX | Custom application wizard |
| AX | Modula-3 Linker information for libraries file |
| AZW3 | Amazon e-reader file format |
| B | BASIC language source code file |
| B | Batch list |
| B | Modula-3 Base program |
| B&W | 1st Reader Mono (Black and White) binary screen image Bitmap graphics |
| B&W | Bitmap graphics (black and white) (atari - mac) |
| B1N | 1st Reader mono and color binary screen image Bitmap graphics |
| B30 | Printer font (JLaser - Cordata) (Ventura Publisher) |