| 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 |
| 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 |
| kor | 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 |
