| km | BMC Patrol Knowledge Module |
| km2 | ActiveModeler Process Map Data |
| kma | Correlate Knowledge Map Data |
| kmcobj | Kinemac Sprite Object |
| kmd | ABstat Batch File |
| Clicker Kernel Module |
| Kazaa Media Desktop Data |
| KMD Animated Model |
| kmdi | Kermeta Data |
| kmdr | KDE Kommander Data |
| kme | Kvaser Memorator Log |
| kmf | Everyone Piano Keyboard Map Data |
| Kwalitan Memo File |
| kml | BMC Patrol Knowledge Module Library |
| EMU48 KML Script |
| KEDIT Macro Library |
| kmmp | Knowledge Master Data |
| kmnb | Keep My Notes Backup Data |
| kmo | Kribi 3D Model |
| kmp | Correlate K-Map Data |
| Keyman Desktop Package |
| Knowledge Master Compressed Map Data |
| kmr | KnowledgeMill Link |
| kms | Correlate Data |
| kmx | Keyman Desktop Compiled Keyboard File |
| kmy | KMyMoney Data |
| kmz | Correlate Knowledge Map Zipped Data |
| knb | Neuro-Expert Knowledge Base Data |
| knd | NEPLAN DOS Export Data |
| kne | iWork Keynote Encrypted Data |
| knf | Orchida Knitting System Data |
| Personal Knowbase Format Data |
| kni | Klango Player Data |
| knj | CDE Japanese Kanji Data |
| knm | iWork Keynote Macro |
| knn | Clarion Database Key Data |
| knnk | OmniPage Internal Data |
| kno | EvREsearch DigIN Serialized Break Model |
| Personal Knowbase Data |
| knt | Miranda IM Keyboard Notify Theme |
| knwf | KNIME Workflow Data |
| knx | Kronos Workforce Link |
| knxprod | KNX ETS Product Database |
| knxtempl | KNX ETS Device Template |
| kob | KASEMAKE Object |
| koc | Koha Offline Circulation Data |
| kof | Reuters Kobra Data |
| kog | EuKaryotic Orthologous Groups Database |
| kok | KaraFun Karaoke Song Data |
| kom | Kit-O-Mat 3D Model |
| komodotool | Komodo IDE Tool Data |
| kon | Yahoo! Widgets XML Data |
| kor | Unreal Engine Korean Language Data |
| Windows Korean Noise-word List |
| kow | Reuters Kobra Data |
| kp | WinOLS Map Data |
| kpa | Korg KAOSS Pad KP3 Data |
| kpd | Kaspersky Lab Application Description |
| kpe | NI KORE Performance Data |
| kpl | Krita Color Palette |
| kpm | KPovModeler Scene Data |
| kpn | KPN Tunnel Data |
| kpu | Physis Piano K5 EX Update Data |
| kqba | KeyQuencer Data |
| kr | Appian Server Data |
| kra | HiCAD 3D Assembly Data |
| kra~ | Krita Temporary Data |
| krd | PreFlight Location Database |
| krf | DNSSEC-Tools Keyrec Data |
| KMESS Reference Curve Data |
| krg | Kraken Rigging Framework Data |
| Sybase Adaptive Server Information Data |
| krl | OpenSSH Key Revocation Lists Data |
| krm | Kenwood CD Player Firmware |
| krn | Humdrum Toolkit KERN Data |
| krp | HiCAD 3D Part Data |
| krx | Siemens NX Reusable Component |
| ks | Progress OpenEdge KeyStore Data |
| ks-ia1 | Infinite Algebra 1 Data |
| ks-ia2 | Infinite Algebra 2 Data |
