| Abbreviation | Definition |
|---|---|
| KEY | Archive .key-file (OS/2) |
| KEY | Datafile (Forecast Pro) |
| KEY | Keyboard macros |
| KEY | Security file (including Registration information) |
| KFX | KoFax Group 4 image Graphics |
| KIT | Power Chords drum kit file (Power Chord) |
| KML | Kedit Macro Library |
| KMP | Korg Multisample Parameter |
| KNN | Clarion Database Key file |
| KPP | Toolpad (SmartPad) |
| KPS | Ibm KIPS bitmap graphics |
| KQP | Konica Quality Photos Bitmap graphics |
| KRZ | Kurzweil K2000 File (Kurzweil) |
| KYB | Keyboard mapping |
| KYE | Game data (Kye) |
| L | Fractint L-System fractal |
| L | Lisp language source code file |
| L | WATCOM WLink Linker directive file |
| LA | Netscape packetized audio (LiveAudio) |
| LAB | Datafile (NCSS - SOLO) |