| Abbreviation | Definition |
|---|---|
| ADC | Lingvo Dictionary file |
| ADC | ScanStudio 16 color Bitmap graphics |
| ADC | TI/ MIT ADC Sound format |
| ADD | Adapter Device Driver |
| ADEX | ADEX Corporation image file |
| ADF | Administration configuration file |
| ADF | Amiga Disk File |
| ADF | Application Definition Format |
| ADI | AutoCAD Device-Independent binary plotter image Graphics |
| ADL | QEMM MCA Adapter Description Library file |
| ADM | AfterDark MultiModule screensaver |
| ADN | Lotus 1-2-3 Add-in |
| ADP | Astound Dynamite file |
| ADP | FaxWorks Setup file for fax modem interaction |
| ADPCM | Intel/ DVI Adaptive Differential Pulse Code Modulation Sound format |
| ADR | AfterDark Randomizer screensaver |
| ADR | Opera Browser Bookmark - Extension |
| ADS | Ada Package Specification |
| ADT | AdTech Fax document |
| ADT | Dictionary (Lingvo) |