| kfo | Konica Minolta Bizhub Copier Overlay Data |
| kfr | Kalles Fraktaler 2 Data |
| kfx | Kofax Capabilities File |
| kgm | KeyTERRA-FIRMA Ground Model Data |
| khd | Microsoft Dynamics AX Kernel Help Documentation |
| khf | Kwalitan Tree Structure |
| khs | Kwalitan History Data |
| kim | Commodore KIM-1 Image |
| kir | Kiruna Magnetometer Data |
| kismac | KisMAC Webservice |
| kiwi | KiwiViewer Scene |
| kjb | Kettle Job File |
| kkk | Filmetrics F20 Material Data |
| klf | KaloMa Data File |
| kli | WUFI Climate Data |
| klip | KlipFolio Klip |
| klk | Orgadata LogiKal Data |
| kll | Keyboard Layout Language File |
| klq | Kaspersky Anti-virus Quarantine File |
| klr | KeyCarbon Keystroke Log |
| klv | Sony XDCAM User Metadata |
| klw | KlattWorks Document |
| klz | Kaspersky Anti-virus Update |
| km | BMC Patrol Knowledge Module |
| kma | Correlate Knowledge Map Data |
| kmcobj | Kinemac Sprite Object |
| kmd | ABstat Batch File |
| kmd | KMD Animated Model |
| kmdi | Kermeta Data |
| kmf | Kwalitan Memo File |
