| aeu | Autoroute Express Europe Route Data |
| af | Serif 3DPlus Model |
| af4 | Audifit v4 Data |
| afb | Alphacam Flame VB Macro |
| afe | Avid File Exchange |
| aff | FRAMES Air Flux File |
| afg | Tablet Assembly Data |
| afm | Acoustic Filter Map File |
| afm | Alphacam Flame Param Macro |
| afp | Alphacam Flame Post Data |
| afr | Arachni Framework Report |
| aft | Ancestry.com Family Tree Database |
| afu | NX Motion Simulation-RecurDyn Function |
| afw | iGrafx FlowCharter Workspace |
| afz | Ancestry.com Family Tree Database Backup |
| afzplug | Corel AfterShot Pro Plug-in |
| aga | ArcGIS ArcGlobe Data |
| agb | Game Boy Advance ROM Image |
| agd | AgileGraph Data File |
| agdb | ANSYS DesignModeler Data |
| ageo | Dream Aquarium Fish Model |
| agf | Zemax ASCII Glass Catalog |
| aggr | Adobe Captivate Aggregate |
| agl | Agile XML Archive |
| aglib | Adobe Photoshop Lightroom Library |
| ags | AGS Data File |
| agsc | XWE Data |
| agt | PeerAgent Typed Executable E-mail Data |
| ah | SEED AH Seismogram Data |
| ahk | AutoHotkey Script |
