| acsauto | Avaya CMS Script |
| act | Microsoft Office Assistant Actor |
| acv | Adobe Photoshop Custom Curve |
| adadownload | Adobe Download Assistant Partial Download |
| add | Adobe PageMaker Plugin |
| add | Microsoft Dynamics AX Application Developer Documentation Data |
| adi | Microsoft Dynamics AX Application Developer Documentation Index |
| ado | Adobe Photoshop Duotone Settings |
| adv | Audio Driver |
| aee | ASUS Data Security Manager Encrypted File |
| aef | Cisco Unity Express Script |
| aex | Adobe After Effects Plug-in |
| agx1 | Adobe FreeHand for Mac Plug-in |
| ahd | Microsoft Dynamics AX Online Help Data |
| ahi | Microsoft Dynamics AX Online Help Index |
| ahq | Creative Audio HQ Plug-in |
| aip | Adobe Illustrator Plugin |
| aix | IBM AIX System File |
| akwf | Oracle ZFS Storage Appliance Workflow |
| almn | Mac OS X Location Manager Module |
| alt | Microsoft Dynamics AX Application Label Temporary File |
| amio | Adobe Audition AMIO Plugin |
| amxx | AMX Mod X Plugin |
| annot | Adobe Digital Editions Annotations |
| aoi | Microsoft Dynamics AX Application Object Index |
| aol | America Online |
| aplg | Audials One Plug-in |
| apln | Adobe InDesign Plug-in |
| aplp | Audials One Plug-in Package |
| appdownload | AppStore Partially Downloaded App |
