| K01 | Clarion Database Key | Database Files | 1 | 1 |
| K02 | Clarion Data File | Data Files | 1 | 1 |
| K03 | Clarion Database Key |
Database Files
| 1 | 1 |
| K04 | Clarion DOS Database Key File |
Database Files
| 1 | 1 |
| K07 | Clarion Database Key |
Database Files
| 1 | 1 |
| K2 | DataFlex Index |
Data Files
| 1 | 1 |
| K25 | Kodak K25 Image | Camera Raw Files | 2 | 1 |
| K26 | Kurzweil K2600 File | Audio Files | 1 | 1 |
| K2P | Kryptel Encrypted Data | Encrypted Files | 1 | 1 |
| K2S | Kaiser 2 Saved Game | Game Files | 1 | 1 |
| K4 | DataFlex Index |
Data Files
| 1 | 1 |
| K4A | Unknown File Type | Uncommon Files | 1 | 1 |
| K7 | DataFlex Index |
Data Files
| 2 | 2 |
| KA | Karma Engine Asset Data |
Game Files
| 1 | 1 |
| KAD | Kore User Data |
Data Files
| 1 | 1 |
| KAI | Unknown File Type |
Uncommon Files
| 1 | 1 |
| KAL | Kratos Vision Data File |
Data Files
| 2 | 1 |
| KAN | Kwalitan Annotation |
Data Files
| 1 | 1 |
| KAP | BSB Chart Image File |
Data Files
| 3 | 1 |
| KAR | Karaoke MIDI File |
Audio Files
| 3 | 1 |
| KAS | Karaoke File |
Data Files
| 1 | 1 |
| KAT | Katorzer Music Composition |
Audio Files
| 1 | 1 |
| KB | C++ Keyboard Script | Developer Files | 1 | 1 |
| KBB | BestCrypt Key Block Backup | Backup Files | 1 | 1 |
| KBD | 3ds Max Keyboard Shortcuts File | Settings Files | 5 | 4 |
| KBF | MyInfo Document |
Data Files
| 1 | 1 |
| KBH | Unknown File Type |
Uncommon Files
| 1 | 1 |
| KBI | Keirsey-Bates Temperament Sorter Index |
Data Files
| 1 | 1 |
| KBK | Medeco XT Codebooks For Keys Data |
Data Files
| 1 | 1 |
| KBM | Scala Keyboard Mapping |
Settings Files
| 1 | 1 |
| KBN | TeamSpeak Keybinding File |
Data Files
| 1 | 1 |
| KBP | Keirsey-Bates Temperament Sorter Profile |
Settings Files
| 1 | 1 |
| KBR | Keirsey-Bates Temperament Sorter Data |
Data Files
| 1 | 1 |
| KBS | Keyboard Script File |
Data Files
| 1 | 1 |
| KBX | GNU Privacy Guard Keybox File |
Data Files
| 1 | 1 |
| KCB | Kindle Textbook Creator File | eBook Files | 1 | 1 |
| KCD | Rshiphop.kcd Malware |
Data Files
| 8 | 2 |
| KCF | KiSS Configuration File |
Settings Files
| 1 | 1 |
| KCH | KChess Game File |
Game Files
| 1 | 1 |
| KCI | Visual Studio .NET DB Project Indexing Settings |
Settings Files
| 1 | 1 |
| KCL | Mario Kart Collision File |
Game Files
| 4 | 3 |
| KCM | KönyvCalc File |
Data Files
| 1 | 1 |
| KCX | Kea Coloring File |
Data Files
| 1 | 1 |
| KD3 | Yayoi Kaikei Accounting Data |
Data Files
| 1 | 1 |
| KDB | KeePass Database File |
Database Files
| 3 | 2 |
| KDBX | KeePass Password Database |
Data Files
| 1 | 1 |
| KDC | Kaspersky Virus Database File |
Data Files
| 11 | 2 |
| KDE | KryptoStorage Container File | Encoded Files | 1 | 1 |
| KDEVELOP | KDevelop Project Data File |
Developer Files
| 1 | 1 |
| KDEVPRJ | KDevelop Project File |
Developer Files
| 1 | 1 |
| KDF | Kinko's File Prep Tool Data | Text Files | 3 | 3 |
| KDH | Chinese Academic Journals Online Full-Text Database |
Database Files
| 1 | 1 |
| KDK | Kodak Proprietary Decimated TIFF File | Raster Image Files | 2 | 1 |
| KDO | Kudo Picture Browser File |
Raster Image Files
| 1 | 1 |
| KDR | Kinetica Installation Data |
Settings Files
| 1 | 1 |
| KDS | KD Player Skin File |
Settings Files
| 14 | 2 |
| KDT | Medbasin Evaporation Data |
Data Files
| 1 | 1 |
| KDZ | Kaspersky Virus Bases File |
Data Files
| 4 | 2 |
| KEA | Panasonic KTS File |
Data Files
| 2 | 2 |
| KED | KEDIT Profile And Macro File |
Developer Files
| 1 | 1 |
| KEP | Turbo Pascal DOS Tp19 Compressed Kepler File | Compressed Files | 1 | 1 |
| KERNEL | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| KES | Kurzweil 3000 Document |
Text Files
| 1 | 1 |
| KEU | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| KEXT | Mac OS X Kernel Extension | System Files | 1 | 1 |
| KEY | License/ Encrypted Security Key File |
Encoded Files
| 21 | 8 |
| KEYNOTE | iWork Keynote '06 Presentation |
Data Files
| 1 | 1 |
| KEYSTORE | Java Keystore File |
Encoded Files
| 3 | 1 |
| KF2 | Max Payne Resource File |
Game Files
| 2 | 1 |
| KFI | 3D Forgastest Editor Data | 3D Image Files | 1 | 1 |
| KFM | Gamebryo 3D Model File |
3D Image Files
| 2 | 1 |
| KFN | KaraFun Karaoke File |
Audio Files
| 2 | 2 |
| KFP | Adobe Acrobat Preflight Profile File |
Settings Files
| 2 | 2 |
| KFS | Max Payne Model File |
Game Files
| 2 | 1 |
| KFT | Korg T-series Wave Data |
Audio Files
| 2 | 2 |
| KFW | Unknown File Type |
Uncommon Files
| 1 | 1 |
| KFX | Amazon KF10 eBook File |
eBook Files
| 4 | 2 |
| KGB | KGB Archive File |
Compressed Files
| 2 | 2 |
| KHF | Kwalitan Data File |
Data Files
| 1 | 1 |
| KHS | Kwalitan History Data File |
Uncommon Files
| 1 | 1 |
| KIC | Kodak Compressed Image File |
Raster Image Files
| 1 | 1 |
| KID | Kidspiration Document |
Data Files
| 1 | 1 |
| KIF | AutoCAD Key Index File Format |
Data Files
| 1 | 1 |
| KIK | Golden Orchard Apple II CD Rom File |
Data Files
| 3 | 2 |
| KIL | Interview File |
Uncommon Files
| 1 | 1 |
| KIN | Kinetic Music Project |
Audio Files
| 1 | 1 |
| KIT | CodeKit File | Web Files | 4 | 3 |
| KIWI | KiwiViewer Scene |
Data Files
| 1 | 1 |
| KIX | KiXtart Script File | Executable Files | 5 | 1 |
| KJV | TheWord Data |
Data Files
| 1 | 1 |
| KK2 | ViewChoice |
Data Files
| 1 | 1 |
| KKA | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| KKB | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| KKT | TTS-Kone File |
Data Files
| 1 | 1 |
| KKW | Adobe RoboHelp Keyword Help Project Index File |
Data Files
| 1 | 1 |
| KL | Haxial KL Source Code File |
Developer Files
| 1 | 1 |
| KLA | KLARFF Map Data |
Data Files
| 2 | 2 |
| KLB | KidPix Sticker, Stamp Album |
Data Files
| 1 | 1 |
| KLC | Microsoft Keyboard Layout Creator Keyboard Data |
Settings Files
| 1 | 1 |
| KLF | KaloMa Data |
Data Files
| 1 | 1 |
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