| 151. | .api | Adobe Printer Ink file (Adobe PhotoShop) ◊ Application Program Interface file (Adobe Acrobat) ◊ Passed parameter file (1st Reader) ◊ Printer driver (Lotus 1-2-3) |
| 152. | .apk | Sound file (Quake2) |
| 153. | .apl | APL work space ◊ Application library file (Centura Team Developer) ◊ Support module (Manugraphics APL products) |
| 154. | .app | Add-in application file (Symphony) ◊ Application object file (dBASE Application Generator) ◊ Executable application file (DR-DOS - NeXTstep - Atari - EPOC) ◊ Generated application (F… 0.3 KB |
| 155. | .apr | ArcView Project File (ODB format) (ArcView) ◊ ArcView project file ◊ Data (Lotus Approach 97) ◊ Employee performance review (Employee Appraiser) |
| 156. | .aps | Advanced patching systems with error checking (similar to IPS) ◊ Data (Microsoft Visual C++) |
| 157. | .apt | Lotus Approach Data view file ◊ Text mode application file (Centura Team Developer) |
| 158. | .apx | Add-on tool (ArchiCAD) ◊ AppExpert database file (Borland C++) ◊ Lotus Approach Paradox-specific information |
| 159. | .aq | Applix data |
| 160. | .arc | Compressed file archive (ARC - PKARC - QUARK - SQUASH) |
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