| .inprogress |
Time Machine Backup Progress File |
| .itls |
iTunes Live Stream URL |
| .ipalias |
iPhoto Alias File |
| .iphoto |
iPhoto Library File |
| .internetconnect |
Apple Internet Connect Document |
| .ideplugin |
Xcode IDE Plug-in |
| .imovielibrary |
iMovie Library File |
| .iadplug |
iAd Producer Plugin |
| .iadclass |
iAd Producer Plugin Class Description File |
| .iadcomponent |
iAd Producer Plugin Component File |
| .iadpage |
iAd Producer Plugin Page Template |
| .iadaction |
iAd Producer Plugin Action Template |
| .iadstyle |
iAd Producer Plugin Style Template |
| .im4p |
IMG4 Payload File |
| .ioplist |
Mac OS X IOPLIST File |
| .iplb |
iPhoto Library Archive Document |
| .iphotoproject |
iPhoto Print Project |
| .imovieevent |
iMovie Event File |
| .key |
Software License Key File, Apple's Keynote software file, keyboard definition file |
| .keychain |
Mac OS X Keychain File |
| .kth |
Keynote Theme |
| .key-tef |
Keynote iCloud Presentation |
| .m4a |
MPEG-4 Audio File |
| .mov |
Apple QuickTime Movie File |