| .3dmf |
QuickDraw 3D Metafile |
| .2mg |
Apple IIGS Disk Image |
| .aif |
Audio Interchange File Format |
| .app |
Mac OS X Application |
| .as |
ActionScript File |
| .aiff |
Audio Interchange File Format |
| .abbu |
Address Book Backup |
| .applescript |
AppleScript Programming Language File |
| .ast |
ClarisWorks Assistant File |
| .action |
Automator Action |
| .afploc |
Apple Filing Protocol Location |
| .appdownload |
Mac App Store Partially Downloaded App |
| .aplibrary |
Aperture Library |
| .apalbum |
Aperture Album File |
| .apxl |
Keynote Presentation Data File |
| .attr |
iPhoto Attributes File |
| .abcddb |
Apple Address Book Contact List |
| .abcdp |
Address Book CoreData Person File |
| .aae |
Sidecar Image Edit File |
| .appex |
OS X Application and System Extension File |
| .alac |
ALAC Encoded Audio File |
| .bundle |
Mac OS X Application Bundle |
| .book |
iBooks Author Document |
| .band |
GarageBand Project File |