| apertureedit | Apple Aperture Edit Data |
| apf | Adobe Profile Format File |
| apf | ATO Profile Data |
| apf | Autodesk Showcase Packet File |
| apfacename | Apple iPhoto Face Data |
| apfolder | Apple Photos Folder Data |
| apg | PowerADA APG File |
| aph | Ability Photoalbum Album Data |
| api | Adobe Photoshop Ink Colors Setup |
| apin | Adobe InDesign Filter |
| apk | GameSpy Arcade Service Data |
| apkg | Anki Exported Flashcard Deck |
| apl | Arcplan Enterprise Object Library |
| aplibrary | Apple Aperture Library |
| aplmodel | iCal Application Layout Data |
| apm | Alphacam Punch Param Macro |
| apmaster | Apple Photos Master Data |
| apmx64 | Rohitab API Monitor x64 Capture Data |
| apmx86 | Rohitab API Monitor Capture Data |
| app | Alphacam Punch Post Data |
| app | ThecusOS Application |
| app | Wii U Game Data |
| appcache | HTML5 Application Cache |
| appcontent-ms | Microsoft Windows Application Content |
| appdata | VMware Workstation appData Data |
| appicon | VMware Workstation appData Icon |
| appinfo | VMware Workstation appData Cache |
| appinstaller | MSIX AppInstaller Setup Data |
| appl | BoxGrinder Appliance Data |
| applace | Apple Photos Place Data |
