| Extension | Description | File Type |
|---|
| kar | Karaoke MIDI File | Audio Files |
| kdc | Kaspersky Virus Database File | Misc Files |
| kdf | VisiQuest Data File | Data Files |
| kdh | Chinese Academic Journals Database File | Misc Files |
| kep | SapShow Training File | Misc Files |
| key | Keyboard Definition File | Settings Files |
| key | WinRAR License File | Misc Files |
| kfb | Pyke Knowledge Fact Base File | Developer Files |
| kfn | Karaoke Song File | Audio Files |
| kgb | KGB Archive File | Encrypted Files |
| kml | Keyhole Markup Language File | Geographical Files |
| kmp | Synthesizer Keymap File | Audio Files |
| kmz | Google Earth Map Location File | Geographical Files |
| kom | Kit-O-Mat Model File | 3D Files |
| kp2 | Kruptos Encrypted File | Encrypted Files |
| kqb | Knowledge Question Base File | Developer Files |
| krb | Pyke Knowledge Rules Base File | Developer Files |
| ksd | Patch File | Audio Files |
| ksv | Kheops Studio Video File | Video Files |
| kwi | Navigation Data File | Data Files |
| kwm | WebMoney Private Key File | Encrypted Files |