| avj | Avira AntiVirus Job Data |
| avl | Avira AntiVirus Status Data |
| avm | AVG Antivirus Incremental Persistent Data |
| avn | altaVENTE Notes |
| avpr | Apache Avro Protocol Data |
| avro | Avro Serialized Data |
| avrolayout | Avro Keyboard Layout Data |
| avroskin | Avro Keyboard Skin Data |
| avs | Adobe Photoshop Variations Data |
| avsc | Apache Avro Schema |
| avst | VirtualDub Template |
| avt | Marvelous Designer Avatar |
| avux | ARGUS Enterprise Exported Properties Data |
| avv | Avid Media Composer Volume Data |
| avz | AviSys v6 Database Backup |
| aw | Answer Wizard Index |
| aw5 | MESA Actigraphy Actigraph Database |
| awa | ActiveWords Archive |
| awb | ActiveWords WordBase Data |
| awb | Ad-Aware Backup Data |
| awbr | WriteOnline WordBar Data |
| awbs | Automated Weight and Balance System Data |
| awcav | ActiveWorlds Custom Avatar |
| awd | AWARD BIOS Firmware Update |
| awd | COREX Automatic Word and Phoneme Segmentation Data |
| awdb | Access Walker Database |
| awe | Adobe Acrobat Bookmark XML Data |
| awf | AUSKey Data |
| awh | ActiveWorlds Browser Help Data |
| awi | Audacity Wave Information Data |
