| 11. | .adi | Graphics (AutoCAD Device-Independent binary plotter image) |
| 12. | .adl | Mca adapter description library (QEMM) |
| 13. | .adm | Administrator policy template (Windows NT) ◊ MultiModule screensaver (AfterDark) |
| 14. | .adn | Add-in (Lotus 1-2-3) |
| 15. | .adp | Dynamic Page file (AOLserver) ◊ Dynamite file (Astound) ◊ Setup file for fax modem interaction (FaxWorks) |
| 16. | .adpcm | Sound (Intel/DVI Adaptive Differential Pulse Code Modulation format) |
| 17. | .adr | Address book (Smart Address) ◊ Randomizer screensaver (AfterDark) |
| 18. | .ads | Ada Package Specification |
| 19. | .adt | Datafile for cardfile application (HP NewWave) ◊ Dictionary (Lingvo) ◊ Fax (AdTech) |
| 20. | .adv | GUS device driver (Gf166.com) ◊ Text document (AdvWriter) |
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