| afploc | Mac OS X Finder AFP Location |
| afpt | Audfprint Audio Fingerprint 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 |
| agd2 | Adobe FreeHand 7 for Mac Data |
| agdb | ANSYS DesignModeler Data |
| age | Age Encrypted Data |
| agent | Forte Agent Data |
| ageo | Dream Aquarium Fish Model |
| agf | Zemax ASCII Glass Catalog |
| aggr | Adobe Captivate Aggregate Data |
| agl | Agile XML Archive |
| aglcomp | Adobe GoLive Component Data |
| agldei | Adobe GoLive Template Data |
| aglib | Adobe Photoshop Lightroom Library |
| aglsl | Adobe GoLive Site Locator Data |
| agprefs | Adobe Photoshop Lightroom Preferences Data |
| ags | AGS Data File |
| agsc | XWE Data |
| agsetup | Ag Leader InCommand Setup Data |
| agt | PeerAgent Typed Executable E-mail Data |
| agw | Aspen Graphics Window Data |
| ah | SEED AH Seismogram Data |
| ahb | AIM High Briefcase Report Data |
| ahead | SCAMP FITS Image Header |
| ahk | AutoHotkey Script |
| ahl | eMule Metadata |
| ahm | Acoustic Head Map File |