| ads | Agricultural Data Interchange Syntax File |
| adsklib | Autodesk Revit Material Library Data |
| adt | ABBYY Lingvo Custom Dictionary Text |
| adt | Act! Template |
| adt | Advantage Database Server Database |
| adt | Alphacam Diecut Tool Data |
| adt | Autodesk AutoCAD Audit Log |
| adt | Casio EX-word Phrase Database |
| adt | HP NewWave Card Application Data |
| adtg | Microsoft Advanced Data TableGram Data |
| adu | Addict Custom Dictionary |
| adups | Android Update Data |
| adw | Adhawin Transliteration Scheme |
| adx | ABBYY Lingvo Dictionary XML Data |
| adx | ALSee Thumbnail Data |
| adx | Lotus Approach Index Data |
| adx | XML-based ADIF File |
| ad_pcf | Alibre Design Catalog Feature Part Data |
| ad_smp | Alibre Design Sheet Metal Parts Data |
| ad_sym | Alibre Design Symbols Data |
| ae1 | FileMaker Pro Runtime Database |
| aea | AdWords Editor Archive |
| aeb | Alphacam Wire EDM VB Macro |
| aec | Cinema 4D After Effects Composition |
| aec | DataCAD AEC Drawing Data |
| aecache | Adobe After Effects Cache |
| aecap | Adobe After Effects Text Template Capsule |
| aedt | ANSYS Electronics Desktop Data |
| aedtz | ANSYS Electronics Desktop Archive |
| aeg | Netmino Data |
| aeix | ARGUS Enterprise Exported Data |
| aek | Adobe After Effects Keyframe |
| aem | Alphacam Wire EDM Param Macro |
| aem | STK Azimuth-Elevation Mask |
| aen | Inventus Antum Secured Mail Encrypted Data |
