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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .K2S | Mantronic Software | Game Files | Kaiser 2 Saved Game | Kaiser 2 | Mantronic Software |
| .KA | Epic Games | Game Files | Karma Engine Asset Data | Unreal Tournament | Epic Games |
| .KCH | Ark Angles | Game Files | KChess Game File | KChess | Ark Angles |
| .KCL | Nintendo | Game Files | Mario Kart Collision File | Mario Kart Wii | Nintendo |
| .KEY | Unknown Developer | Game Files | License/ Encrypted Security Key File | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
| .KF2 | Rockstar Games | Game Files | Max Payne Resource File | chUmbaLum sOft MilkShape 3D | chUmbaLum sOft |
| .KFN | Recisio | Game Files | KaraFun Karaoke File | KaraFun | Recisio |
| .KFS | Rockstar Games | Game Files | Max Payne Model File | chUmbaLum sOft MilkShape 3D | chUmbaLum sOft |
| .KMP | Korg | Game Files | Korg Trinity/Triton Keymap File | Awave Studio | FMJ-Software |
| .KN5 | Kunos Simulazioni | Game Files | Assetto Corsa 3D Object | Assetto Corsa | Kunos Simulazioni |
| .KOR | Epic Games | Game Files | Unreal Engine Language Localization | Unreal Tournament | Epic Games |
| .KPR | Open Source | Game Files | KPresenter Presentation | KOffice | Open Source |
| .KRN | EA Maxis | Game Files | NBA Live 99 Fonts File | NBA Live 99 | Electronic Arts |
| .KSV | Kheops Studio Company | Game Files | Kheops Studio Video | Kheops Studio | Kheops Studio Company |
| .KTO | Kunos Simulazioni | Game Files | NetKar Pro Mid Ohio Data | netKar Pro | Kunos Simulazioni |
| .KVQ | Sega | Game Files | Sega Smash Pack PC Version File | Sega Smash Pack | Sega |
| .KWD | KDE | Game Files | KWord Document | KOffice | Open Source |
| .KYE | Colin Garbutt | Game Files | Kye Level Data | Kye | Colin Garbutt |
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