| kof | Reuters Kobra Data |
| kog | EuKaryotic Orthologous Groups Database |
| kok | KaraFun Karaoke Song Data |
| kon | Yahoo! Widgets XML Data |
| kor | Windows Korean Noise-word List |
| kow | Reuters Kobra Data |
| kp | WinOLS Map Data |
| kpd | Kaspersky Lab Application Description |
| kpe | NI KORE Performance Data |
| kpn | KPN Tunnel Data |
| kqba | KeyQuencer Data |
| kr | Appian Server Data |
| krd | PreFlight Location Database |
| krf | DNSSEC-Tools Keyrec Data |
| krg | Kraken Rigging Framework Data |
| krg | Sybase Adaptive Server Information Data |
| krl | OpenSSH Key Revocation Lists Data |
| krm | Kenwood CD Player Firmware |
| krn | Humdrum Toolkit KERN Data |
| krx | Siemens NX Reusable Component |
| ks-ia1 | Infinite Algebra 1 Data |
| ks-ia2 | Infinite Algebra 2 Data |
| ksd | IHS Kingdom Seismic Data |
| ksd | KeepSafe Data |
| kse | Keepsake Studio Export File |
| kseqs | SAM Kestrel Sequence Database |
| ksg | Kwalitan Segment File |
| ksi | Alloy Blending System KSI Data |
| ksk | Adobe Illustrator Kinsoku Set |
| ksl | Karaoke Song List Creator Data |
