| Abbreviation | Definition |
|---|---|
| ADT | HP NewWave Cardfile Application Datafile |
| ADV | GUS device driver (Gf166.com) |
| ADX | Approach InDeX file |
| ADX | Archetype Designer Document file |
| AEX | Alpha linked executable file |
| AEX | PGP Armored Extracted Public |
| AEXPK | PGP Armored EXtracted Public Key |
| AF2 | ABC FlowCharter 2.0 Flowchart |
| AF3 | ABC FlowCharter 3.0 Flowchart |
| AFC | Apple sound |
| AFF | Application File Format |
| AFI | Truevision Bitmap graphics |
| AFL | AnimaFLex RubberFlex animation file |
| AFL | Lotus 1-2-3 Font file (for Always) |
| AFM | Abassis Finance Manager data file |
| AFM | Adobe Font Metrics (Type 1 font metrics for font installers) |
| AFN | Attribute Field Name |
| AFP | ABC FlowCharter shape Palette |
| AFP | Shape palette (ABC FlowCharter) |
| AFS | Automatic File System |