| avastlic | Avast Antivirus License Data |
| avc | Kaspersky Anti-virus Database |
| avd | Avery LabelPro Database |
| avdl | Apache Avro IDL Data |
| avg | AVG Antivirus Virus Database |
| avgdi | AVG Internet Security Diagnostics Data |
| avgdx | AVG Internet Security Diagnostics Data |
| avgf | AVG Internet Security Data |
| avglic | AVG Internet Security License Data |
| avgtheme | AVG Internet Security Theme Data |
| avgvpn | AVG Secure VPN License Data |
| avj | Avira AntiVirus Job Data |
| avn | altaVENTE Notes |
| avpr | Apache Avro Protocol Data |
| avro | Avro Serialized Data |
| avroskin | Avro Keyboard Skin 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 |
| awbr | WriteOnline WordBar Data |
| awbs | Automated Weight and Balance System Data |
| awcav | ActiveWorlds Custom Avatar |
| awd | AWARD BIOS Firmware Update |
| awdb | Access Walker Database |
| awe | Adobe Acrobat Bookmark XML Data |
| awh | ActiveWorlds Browser Help Data |
| awkw | Awkwords Generated Data |
| awn | Avant Window Navigator Theme Data |
| awr | Ad-Aware Reference Data |
| awr | Iconics AlarmWorX32 Report File |