| kismac | KisMAC Webservice |
| kiwi | KiwiViewer Scene |
| kjb | Kettle Job File |
| kjv | theWord King James Version Module |
| kkk | Filmetrics F20 Material Data |
| kkw | Adobe RoboHelp Keyword Help Project Index |
| klb | KidPix Stamp Album |
| 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 |
| klx | Kelk 2000 Data |
| klz | Kaspersky Anti-virus Update |
| km | BMC Patrol Knowledge Module |
| km2 | ActiveModeler Process Map Data |
| kma | Correlate Knowledge Map Data |
| kmcobj | Kinemac Sprite Object |
| kmd | ABstat Batch File |
| kmd | KMD Animated Model |
| kmdi | Kermeta Data |
| kme | Kvaser Memorator Log |
| kmf | Kwalitan Memo File |
| kml | KEDIT Macro Library |
| kml | BMC Patrol Knowledge Module Library |
| kmo | Kribi 3D Model |
| kmp | Keyman Desktop Package |
| kmr | KnowledgeMill Link |
| kms | Correlate Data |
| kmx | Keyman Desktop Compiled Keyboard File |
| kmy | KMyMoney Data |