| .afi |
AOMEI Backupper File Backup File |
| .article |
Twixl Publisher Article |
| .album |
GLC_Player Album File |
| .arn |
Autoruns Data File |
| .awbr |
WriteOnline WordBar File |
| .addism |
Addism Data File |
| .aldf |
Aldfaer Genealogy File |
| .avhdx |
Automatic Virtual Hard Drive File |
| .acq |
AcqKnowledge Data Graph File |
| .aseprite |
Aseprite Sprite File |
| .aurora |
Aurora Ransomware Encrypted File |
| .afphoto |
Affinity Photo Document |
| .arj |
ARJ Compressed File Archive |
| .ad |
After Dark Screensaver |
| .afm |
Adobe Font Metrics File |
| .ann |
Lingvo Dictionary Annotation File |
| .alaw |
A-Law Compressed Sound Format |
| .api |
Adobe Photoshop Inks File |
| .ahx |
WinAHX Tracker Module |
| .ada |
Ada Source Code |
| .aty |
Association Type Placeholder |
| .ac5 |
ArtCut 5 Document |
| .ac6 |
ArtCut 6 Document |
| .all |
Java RMI Policy File |