| kvx | Voxel Data |
| kwa | KWIVER Video Data |
| kwb | BrailleNote KeyWord Braille |
| kwb | Kwalitan Work File |
| kwc | Flipnote Studio 3D Comments Data |
| kwd | Klusta Kwik RAW Data |
| kwe | kCura Win Edds Data |
| kwf | Kwalitan Word List |
| kwi | KIWI Navigation Data |
| kwik | Klusta Kwik Data |
| kwl | KWalletManager Data |
| kwm | WebMoney Key |
| kwo | KeyWallet Encrypted Password Storage |
| kws | Alexa Voice Service Keyword Spotting Data |
| kws | KeyWallet Skin |
| kwt | BrailleNote KeyWord Text |
| kwu | KWUROHR Data |
| kwx | kCura Win Edds Export Data |
| kwx | Klusta Kwik Spiking Data |
| kwy | Keepaway Framework Learning Curve Data |
| kwz | Flipnote Studio 3D Flipnote Data |
| kxp | Key Home Gourmet Data File |
| kxs | kX Project Skin |
| kxw | Pedigree Central Database Index |
| kxy | SUPCRT92 K Values File |
| kyn | ALSee Thumbnail Cache |
| kyr | Lotus Domino Server Keyring |
| kzm | Karizma Designer Album |
| kzx | Kerkythea Zipped XML Material Data |
| l | FractInt L-System Fractal Data |
