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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .K26 | Kurzweil Education | Audio Files | Kurzweil K2600 File | Awave Studio | FMJ-Software |
| .KAR | Various Developers | Audio Files | Karaoke MIDI File | KaraFun | Recisio |
| .KAT | Unknown Developer | Audio Files | Katorzer Music Composition | Katorzer | Unknown Developer |
| .KFN | Recisio | Audio Files | KaraFun Karaoke File | KaraFun | Recisio |
| .KFT | FMJ-Software | Audio Files | Korg T-series Wave Data | Awave Studio | FMJ-Software |
| .KIN | Cakewalk, Inc. | Audio Files | Kinetic Music Project | Cakewalk SONAR | Cakewalk, Inc. |
| .KIT | Bryan | Audio Files | CodeKit File | CodeKit | Bryan |
| .KMP | Korg | Audio Files | Korg Trinity/Triton Keymap File | Awave Studio | FMJ-Software |
| .KOZ | Chaoticom | Audio Files | Audiokoz Music File | Unknown Software | Unknown Developer |
| .KR1 | Kurzweil Education | Audio Files | Kurzweil 2000 Sample File | Awave Studio | FMJ-Software |
| .KRK | Interscape | Audio Files | Karaoke Music File | JBK Karaoke Player | Interscape |
| .KRX | Various Developers | Audio Files | Karaoke MIDI File | KaraFun | Recisio |
| .KRZ | Kurzweil Education | Audio Files | Kurzweil K2000 File | Kurzweil K2600 | Kurzweil Education |
| .KSC | Korg | Audio Files | Korg Trinity/Triton Script File | Awave Studio | FMJ-Software |
| .KSD | KeepSafe Software, Inc. | Audio Files | KeepSafe File | KeepSafe Private Photo Vault | KeepSafe Software, Inc. |
| .KSF | Pandora Tv | Audio Files | KMPlayer Skin File | KMPlayer | Pandora Tv |
| .KSM | Pfaff | Audio Files | Pfaff Embroidery Design File Format | Embroidermodder 2 | Open Source |
| .KSS | FabTrol Systems | Audio Files | FabTrol MRP Template | FabTrol | FabTrol Systems |
| .KT2 | Native Instruments | Audio Files | Battery 2 Drum Kit File | Native Instruments Kontakt | Native Instruments |
| .KTP | Cakewalk, Inc. | Audio Files | Kinetic Project Template | Cakewalk SONAR | Cakewalk, Inc. |
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