| .KBD | Autodesk, Inc. | Instellingsbestanden | 3ds Max Keyboard Shortcuts File | Autodesk 3ds Max | Autodesk, Inc. |
| .KBM | Manuel Op De Coul | Instellingsbestanden | Scala Keyboard Mapping | Scala | Manuel Op De Coul |
| .KBP | Keirsey Group | Instellingsbestanden | Keirsey-Bates Temperament Sorter Profile | Keirsey-Bates Temperament Sorter | Keirsey Group |
| .KCF | William Miles | Instellingsbestanden | KiSS Configuration File | Kisekae Set System (KiSS) | William Miles |
| .KCI | Microsoft Corporation | Instellingsbestanden | Visual Studio .NET DB Project Indexing Settings | Microsoft Visual Studio | Microsoft Corporation |
| .KDR | Thermo Fisher Scientific Inc. | Instellingsbestanden | Kinetica Installation Data | Kinetica | Thermo Fisher Scientific Inc. |
| .KDS | Knyzhov Dmitry | Instellingsbestanden | KD Player Skin File | Microsoft Notepad | Microsoft Corporation |
| .KEY | Unknown Developer | Instellingsbestanden | License/ Encrypted Security Key File | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
| .KFP | Adobe Systems Incorporated | Instellingsbestanden | Adobe Acrobat Preflight Profile File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .KIK | Apple | Instellingsbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .KLC | Microsoft Corporation | Instellingsbestanden | Microsoft Keyboard Layout Creator Keyboard Data | Microsoft Keyboard Layout Creator | Microsoft Corporation |
| .KNT | SourceForge | Instellingsbestanden | KeyNote Note File | Keynote | SourceForge |
| .KOF | Borland | Instellingsbestanden | Kylix Options Data | Borland Kylix | Borland |
| .KPF | ActiveState | Instellingsbestanden | Komodo Project File | ActiveState Komodo IDE | ActiveState |
| .KPL | Phrogsoft | Instellingsbestanden | Kids Programming Language Source Code | Phrogram | Phrogsoft |
| .KSF | Pandora Tv | Instellingsbestanden | KMPlayer Skin File | KMPlayer | Pandora Tv |
| .KUIP | Kingsoft | Instellingsbestanden | Kingsoft Office Personalization File | WPS Office | Kingsoft |
| .KVT | Open Source | Instellingsbestanden | KVIrc Heme | KVIrc | Open Source |
| .KWS | KeyWallet GbR | Instellingsbestanden | KeyWallet Skin | KeyWallet | KeyWallet GbR |
| .KWT | Open Source | Instellingsbestanden | KVIrc Theme | KVIrc | Open Source |
| .KX | Ruud Van Velsen | Instellingsbestanden | KiXtart Tokenized Script | KixTart | Ruud Van Velsen |
| .KYB | Software AG | Instellingsbestanden | Keyboard Layout | Entire Connection | Software AG |
| .KYS | Adobe Systems Incorporated | Instellingsbestanden | Adobe Photoshop Keyboard Shortcuts File | Adobe Illustrator CC | Adobe Systems Incorporated |
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