| Abbreviation | Definition |
|---|---|
| A60 | Roland Garros Tennis MVTS File |
| A64 | Artist 64 file |
| A6P | Authorware Application |
| A8 | Alpha channel image data (24-bit 3D animation) ( Cubicomp PictureMaker) |
| A8 | Cubicomp PictureMaker 24bit 3D Animation file |
| A8 | Cubicomp PictureMaker Alpha channel image data (24-bit 3D animation) |
| A86 | A86 Assembler Source Code |
| A86 | Assembly language source code file (A86) |
| AAA | App Cam Automation file |
| AAA | Softphrase Automation File |
| AAA | Sybase SQLAnywhere Temp File |
| AAA | Xtal Backup file |
| AAF | Advanced Authoring Format File |
| AAP | Apollo Advanced Playlist |
| AB6 | Datafile (ABStat) |
| AB8 | Datafile (ABStat) |
| ABC | ABC FlowCharter Document |
| ABC | ABC programming language General filename extension |
| ABC | Musical notation language file |
| ABC | Musical notation language file (folk melodies) |