| adm | Advantage Database Server Memo Data |
| adm | Alphacam Diecut Param Macro |
| adm | Windows Administrative Template |
| adn | Lotus 1-2-3 Add-in |
| adn | Microsoft Access Blank Project Template |
| adobebridge | Adobe Bridge URL Data |
| adobenet | Adobe Production Studio Data |
| adp | Alphacam Diecut Post Data |
| adq | Microsoft Application Compatibility Toolkit Query Data |
| adr | After Dark Randomizer Data |
| adr | z-Tree Address Data |
| ads | ADS40 Header Data |
| 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 | 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 |
