List of All the File Extensions Formats and Types Starting With the Letter K
| File Extension | Description |
| .KA | Karma engine (Unreal) asset |
| .KAHL | Think Pascal KAHL text |
| .KAL | KManager calibration data |
| .KAN | Kwalitan annotation |
| .KAP | Maptech BSB map |
| .KEA | Panasonic KTS |
| .KED | KEDIT profile and macro |
| .KER | ENVI filter kernels |
| .KEXT | Apple Mac OS X Kernel |
| .KEYCHAIN | Apple Keychain password |
| .KEYNOTE | iWork Keynote ’06 presentation |
| .KEY | iWork Keynote ’09 presentation Microsoft Windows 7 registry key ArcView geocoding matching keys Avira AntiVir Personal license key BioWare Infinity and Aurora game engine resource DataCAD custom toolbar Keyboard definition Licence or encrypted security OS/2 archive key files |
| .KEYSTORE | Java keytool key database |
| .KOA | Koala paint C64 format |
| .KOM | Kit-O-Mat 3D model |
| .KOR | Korean localization language |