| Abbreviation | Definition |
|---|---|
| AP | Datalex EntryPoint 90 Data file |
| AP | Whap Compressed Amiga file archive |
| APC | Lotus 1-2-3 Printer driver Characters |
| APD | Aldus PageMaker Aldus Printer Description |
| APD | Lotus 1-2-3 Printer driver |
| APF | Printer driver fonts (Lotus 1-2-3) |
| API | 1st Reader Passed parameter file |
| API | Adobe Acrobat Plug-In |
| API | Adobe Printer Ink file |
| API | Application Program Interface file |
| API | Lotus 1-2-3 Printer driver |
| APK | Android application package file |
| APL | APL work space |
| APL | Manugraphics APL products Support module |
| APP | dBASE Application Generator APPlication object file |
| APP | DR-DOS Executable APPlication file |
| APP | FoxPro Generated APPlication |
| APP | Symphony Add-in APPlication file |
| APR | Employee Appraiser Employee performance review APPraisal file |
| APR | Lotus APProach 97 Data file |