| kvt | KVIrc Theme Data |
| kvx | Voxel Data |
| kvx | KM-NET Viewer v5 Workspace |
| kwa | KWIVER Video Data |
| kwb | Kwalitan Work File |
| kwb | BrailleNote KeyWord Braille |
| kwc | Flipnote Studio 3D Comments Data |
| kwe | kCura Win Edds Data |
| kwf | Kwalitan Word List |
| kwi | KIWI Navigation Data |
| kwm | WebMoney Key |
| kwo | KeyWallet Encrypted Password Storage |
| kws | KeyWallet Skin |
| kwt | BrailleNote KeyWord Text |
| kwu | KWUROHR Data |
| kwx | kCura Win Edds Export Data |
| kwy | Keepaway Framework Learning Curve Data |
| kwz | Flipnote Studio 3D Flipnote Data |
| kxp | Key Home Gourmet Data File |
| 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 |
| l01 | EnCase Logical Evidence Data |
| l2l | IBM Voice Type Languages Addword Data |
| l4d | Maxon Cinema 4D Layout Data |
| l5k | RSLogix 5000 Project Export Data |
| l5x | RSLogix 5000 XML Data |
| l64 | 64LAN Image |
| l6t | Line 6 POD HD500X Tone Data |
| la | Microth InPad Layout File |
| lab | MRMC Label Data |
| lab | Steinberg WaveLab CD/DVD Label Set |