| File extension | Developer/Producer | File description |
|---|---|---|
| K file extension | Schrödinger, LLC | MacroModel Chemical Modeller Output |
| K01 file extension | SoftVelocity | Clarion Database Key |
| K02 file extension | SoftVelocity | Clarion |
| K03 file extension | SoftVelocity | Clarion DOS Database Key |
| K1 file extension | The Database Managers, Inc. | DataFlex Index |
| K10 file extension | The Database Managers, Inc. | DataFlex Index |
| K11 file extension | The Database Managers, Inc. | DataFlex Index |
| K12 file extension | The Database Managers, Inc. | DataFlex Index |
| K13 file extension | The Database Managers, Inc. | DataFlex Index |
| K14 file extension | The Database Managers, Inc. | DataFlex Index |
| K15 file extension | The Database Managers, Inc. | DataFlex Index |
| K2 file extension | The Database Managers, Inc. | DataFlex Index |
| K25 file extension | N/A | Kurzweil 2500 Sample Format |
| K26 file extension | N/A | Kurzweil 2600 Sample Format |
| K2P file extension | Inv Softworks LLC. | Kryptel Encrypted |
| K2S file extension | Mantronic Software | Kaiser 2 Saved Game |
| K3 file extension | The Database Managers, Inc. | DataFlex Index |
| K3B file extension | K3b | K3b Burning Project Format |
| K3G file extension | Third Generation Partnership Project | 3GP Mobile Phone Video Format |
| K4 file extension | The Database Managers, Inc. | DataFlex Index |
| K48 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| K5 file extension | The Database Managers, Inc. | DataFlex Index |
| K6 file extension | The Database Managers, Inc. | DataFlex Index |
| K7 file extension | The Database Managers, Inc. | DataFlex Index |
| K8 file extension | The Database Managers, Inc. | DataFlex Index |
| K9 file extension | The Database Managers, Inc. | DataFlex Index |
| KA file extension | Epic Games, Inc. | Karma Engine (Unreal) Asset |
| KAD file extension | Native Instruments, Inc. | Kore User |
| KAHL file extension | N/A | Think Pascal KAHL Text |
| KAL file extension | Hondata, Inc. | KManager Calibration Data |
| KAN file extension | Vincent Peters | Kwalitan Annotation |
| KAP file extension | Maptech | Maptech BSB Map Format |
| KAR file extension | N/A | MIDI Karaoke Format |
| KAS file extension | N/A | Karaoke |
| KB file extension | Borland | Borland C++ Keyboard Script Format |
| KB2 file extension | Carroll-Net | Carroll-Net Kleo Backup Format |
| KBB file extension | Jetico, Inc. | BestCrypt Key Block Backup |
| KBD file extension | N/A | Keyboard Script File Layout |
| KBF file extension | Milenix Software Ltd. | MyInfo Document |
| KBM file extension | Manuel Op de Coul | Scala Keyboard Mapping |
| KBN file extension | TeamSpeak Systems | TeamSpeak Keybinding |
| KBS file extension | PC Dirck | Keyboard Script Saved Keystrokes Format |
| KBX file extension | Free Software Foundation, Inc. | GNU Privacy Guard Keybox |
| KC2 file extension | N/A | Kodak RAW Image |
| KCF file extension | KiSS Team | KiSS Configuration |
| KCH file extension | Ark Angles | KChess Notation |
| KCI file extension | Microsoft Corporation | Visual Studio .NET DB Project Indexing Settings |
| KCL file extension | Nintendo | Mario Kart Wii Collision Information Format |
| KCT file extension | Tavultesoft | Keyman Developer Customization Source |
| KD3 file extension | Yayoi Co., Ltd. | Yayoi Kaikei Accounting Data |
| KDA file extension | NovaLogic, Inc. | Nova Logic Game |
| KDB file extension | KeePass | Encrypted Passwords Database Format |
| KDBX file extension | KeePass Password Safe | KeePass Password Database Format |
| KDC file extension | Kaspersky Lab | Kaspersky Virus Database Format |
| KDD file extension | Adobe Systems Incorporated | Adobe Authorware RTF Objects Editor Knowledge Display |
| KDE file extension | Kaspersky Labs | Kaspersky KryptoStorage Encrypted Format |
| KDELNK file extension | KDE e.V | KDE Desktop |
| KDENLIVE file extension | Kdenlive | Kdenlive Project Format |
| KDEVDLG file extension | Free Software Foundation | KDevelop Dialogue Box Format |
| KDEVELOP file extension | Free Software Foundation | KDevelop Project Data Format |
| KDEVPRJ file extension | Free Software Foundation | KDevelop Project Format |
| KDF file extension | Stephen Kay | KARMA MW/Triton Data |
| KDH file extension | N/A | Chinese Academic Journals Online Full-text Database |
| KDI file extension | KD Player | KD Player Skin Image Format |
| KDK file extension | Kodak | Kodak Proprietary Decimated TIFF Format |
| KDL file extension | Team T10C6 | Kill The Deadline Storage |
| KDMP file extension | Microsoft | Microsoft Windows Crash Dump Format |
| KDR file extension | Thermo Fisher Scientific Inc. | Kinetica Installation |
| KDS file extension | KD Player | KD Player Skin Format |
| KDT file extension | Laboratory of Reclamation Works & Water Resources Management | Medbasin Evaporation Data |
| KDX file extension | Google Inc. | Google Earth Import Definition |
| KDZ file extension | Kaspersky Labs | Kaspersky Anti-Virus Data Format |
| KEB file extension | Kaspersky Labs | Kaspersky Anti-Virus Base Format |
| KED file extension | Mansfield Software Group, Inc. | KEDIT Profile And Macro Format |
| KEP file extension | Embarcadero Technologies, Inc. | Turbo Pascal DOS Tp19 Compressed Kepler |
| KER file extension | Exelis Visual Information Solutions | ENVI Filter Kernels |
| KES file extension | Kurzweil Educational Systems | Kurzweil 3000 Document Format |
| KEV file extension | Freedom Scientific, Inc. | JAWS Preload |
| KEX file extension | Mansfield Software Group, Inc. | KEDIT Profile Macro |
| KEXI file extension | Kexi Team | Kexi Database Format |
| KEXIC file extension | Kexi Team | Kexi Database Connection Settings Format |
| KEXIS file extension | Kexi Team | Kexi Database Connection Format |
| KEXT file extension | N/A | Apple Mac OS X Kernel Extension Format |
| KEY file extension | Apple | IWork Keynote 09 Presentation Format |
| KEY-TEF file extension | Apple | Apple Keynote ICloud Presentation Format |
| KEYBOARD file extension | W3C | Amaya Configuration |
| KEYCHAIN file extension | Apple | Apple Keychain Password Format |
| KEYNOTE file extension | Apple, Inc. | IWork Keynote 06 Presentation |
| KEYSTORE file extension | Oracle Corporation | Java Keytool Key Database |
| KEYTAB file extension | Apple, Inc. | Unix Kerberos Encrypted Key |
| KF file extension | N/A | The Elder Scrolls Game |
| KF8 file extension | N/A | Amazon Kindle Format 8 |
| KFG file extension | Adobe Systems Incorporated | Adobe Acrobat Rule |
| KFI file extension | N/A | 3D Forgastest Editor |
| KFL file extension | KFLog Team | KFLog Airfield |
| KFM file extension | Gamebase | GameBryo KFM Format |
| KFN file extension | Recisio | KaraFun Karaoke Song Format |
| KFS file extension | Rockstar Games, Inc. | Max Payne Model |
| KFT file extension | N/A | Korg T-series Wave |
| KFX file extension | Kofax | Kofax Group 4 Bitmap Graphics Format |
| KGB file extension | Tomasz Pawlak | KGB Archiver Compressed Archive Format |
| KGE file extension | Tomasz Pawlak | KGB Archiver Encrypted Compressed Archive |
| KGM file extension | N/A | KeyTERRA-FIRMA Ground Model |
| KGS file extension | Philipp Konerding | Kogeo Toolbar |
| KHD file extension | Microsoft | Microsoft Dynamics AX Kernel Help Data Format |
| KHI file extension | Microsoft | Microsoft Dynamics AX Kernel Help Index Format |
| KIC file extension | Kodak | Kodak Compressed Image Format |
| KID file extension | Inspiration | Kidspiration Document Format |
| KID2 file extension | The Software MacKiev Company | Kid Pix |
| KIDS file extension | The Software MacKiev Company | Kid Pix |
| KIF file extension | Autodesk, Inc. | AutoCAD Key Index |
| KIN file extension | N/A | Cakewalk Kinetic Music Project Format |
| KISMAC file extension | N/A | KisMAC Web Service Format |
| KIT file extension | 20-20 Technologies | 20-20 Design Kitchen Design Format |
| KIX file extension | KiXtart | KiXtart Script Format |
| KJV file extension | Costas Stergiou | TheWord Bible Software King James Version Bible |
| KKD file extension | Kandalu Software Ltd | K Kitchen Burning Project |
| KKW file extension | Adobe Systems Incorporated | Adobe RoboHelp Keyword Help Project Index |
| KLC file extension | Microsoft Corporation | Microsoft Keyboard Layout Creator Keyboard |
| KLD file extension | Electronic Arts, Inc. | Dungeon Keeper 2 Playable Map |
| KLF file extension | Frank Böpple | KaloMa |
| KLG file extension | N/A | Log Format |
| KLK file extension | Orgadata AG | Orgadata LogiKal |
| KLM file extension | Google Inc. | Keyhole Markup Language (Google Earth) |
| KLP file extension | PHOENIX CONTACT | CLIP PROJECT Terminal-strip Project |
| KLQ file extension | Kaspersky | Kaspersky Anti-Virus Quarantine Format |
| KM file extension | BMC Software, Inc. | BMC Patrol |
| KMA file extension | Correlate | Correlate Archive Knowledge Map |
| KMC file extension | Kinemac | Kinemac Animation Format |
| KMCOBJ file extension | Kinemac | Kinemac Sprite Object Format |
| KMD file extension | AndersonBell Corp | ABSTAT For Windows Batch |
| KMDI file extension | The Eclipse Foundation | Kermeta |
| KMDR file extension | N/A | Kommander |
| KMF file extension | Vincent Peters | Kwalitan Memo |
| KML file extension | N/A | Google Earth Keyhole Markup Language Format |
| KMM file extension | K-Meleon | K-Meleon Macro Module Format |
| KMN file extension | Tavultesoft | Keyman Developer Source |
| KMP file extension | Korg | Korg Trinity Audio Format |
| KMR file extension | KnowledgeMill | KnowledgeMill Link Format |
| KMS file extension | Correlate | Correlate Solution Topic |
| KMT file extension | The Eclipse Foundation | Kermeta |
| KMV file extension | N/A | Mobile DJ Video Format |
| KMX file extension | Tavultesoft | Keyman Desktop Compiled Keyboard |
| KMY file extension | KMyMoney | KMyMoney Data Format |
| KMZ file extension | Compressed Keyhole Markup Language (Google Earth) Format | |
| KNF file extension | Orchida Soft | Orchida Knitting System |
| KNN file extension | SoftVelocity | Clarion Database Key |
| KNNK file extension | Nuance Communications, Inc. | OmniPage |
| KNO file extension | EvREsearch | DigIN Serialized Break Model |
| KNT file extension | KeyNote | Tranglos KeyNote Note Format |
| KNW file extension | Live for Speed - Scawen Roberts, Eric Bailey, Victor van Vlaardingen | Live For Speed AI Knowledge |
| KO file extension | N/A | Linux Kernel Module Format |
| KOA file extension | N/A | Koala Paint C64 |
| KOB file extension | AG/CAD Limited | Kasemake 3D Object |
| KODAK file extension | N/A | Kodak Photo CD Format |
| KODU file extension | Microsoft | Kodu Game Format |
| KOE file extension | Aquest | AquesTone Vocal Synthesizer Syllable |
| KOM file extension | KingMill Enterprises LLC | Kit-O-Mat 3D Model |
| KOMODO file extension | Charles Brej PhD, BSc | KMD |
| KON file extension | N/A | Yahoo! Widget XML Format |
| KOOB file extension | Vijay Sridhara | Koob E-Book Format |
| KOR file extension | Microsoft | Korean Localization Language Format |
| KOZ file extension | N/A | Bell Music Format |
| KPDX file extension | N/A | KeePass Password Database |
| KPE file extension | Native Instruments, Inc. | KORE Performance |
| KPF file extension | ActiveState Software | Komodo Project Format |
| KPG file extension | Metacreations | |
| KPJ file extension | N/A | Keyman Developer Project |
| KPL file extension | Brilliant Digital Entertainment | KMPlayer Playlist Format |
| KPP file extension | The Learning Company | Kid Pix Presentation Format |
| KPR file extension | KOffice | KOffice KPresenter Presentation Format |
| KPS file extension | N/A | IBM KIPS Bitmap Image Graphics |
| KPT file extension | N/A | KPresenter Template |
| KPX file extension | The Learning Company | Kid Pix Deluxe Data Format |
| KPZ file extension | ActiveState Software | Komodo Template Format |
| KQP file extension | N/A | Konica Camera Photo |
| KR1 file extension | N/A | Kurzweil 2000 Sample |
| KRAW file extension | Apple, Inc. | Mac OS X Kernel-RAW Image Format |
| KRC file extension | Kra-Tronic Corp | Mouse And Key Recorder Recorded Settings |
| KRG file extension | Sybase Inc. | Sybase Adaptive Server Information |
| KRN file extension | Electronic Arts, Inc. | NBA 99 Fonts |
| KRT file extension | Microsoft Corporation | Microsoft Visual FoxPro Recreation |
| KRZ file extension | N/A | Kurzweil 2000 Sample Format |
| KS file extension | N/A | Kickstart Format |
| KS-IA1 file extension | Kuta Software LCC | Infinite Algebra |
| KS3 file extension | N/A | 3D Forgastest Editor |
| KSC file extension | Korg | Korg Trinity Script Format |
| KSD file extension | Native Instruments, Inc. | Absynth Kore Patch Format |
| KSDS file extension | Native Instruments, Inc. | Absynth Kore Patch Format |
| KSEQS file extension | Richard Hughey - Kevin Karplus - Anders Krogh | Kestrel Sequence Database |
| KSF file extension | Korg | Korg Trinity Sample Format |
| KSH file extension | N/A | Unix Shell Script |
| KSI file extension | Tube City IMS, LLC. | Alloy Blending System ASCII Data |
| KSL file extension | Airwer Ltd | Karaoke Song List Creator Song List |
| KSM file extension | Ken Silverman | Ken Silverman Music Format |
| KSML file extension | Gearbox Software | Halo Custom Edition |
| KSP file extension | KDE e.V | Calligra Sheets Spreadsheet |
| KSS file extension | FabTrol Systems | FabTrol MRP Template |
| KT2 file extension | Native Instruments | Battery 2 Drum Kit File Format |
| KT3 file extension | Native Instruments | Battery 3 Drum Kit File Format |
| KTH file extension | N/A | Apple IWork Keynote Theme Format |
| KTN file extension | KTooN | KTooN Animation Format |
| KTO file extension | Kunos Simulazioni | NetKar Pro Mid Ohio |
| KTP file extension | N/A | Cakewalk Kinetic Project Template |
| KTX file extension | Vincent Peters | Kwaitan |
| KTZ file extension | ACTF | Kahootz Project Format |
| KV6 file extension | Ace of Spades | Ace Of Spades Model Format |
| KVK file extension | Tavultesoft | Keyman Desktop On Screen Keyboard |
| KVT file extension | KVIrc.net | KVIrc Theme |
| KVTML file extension | The KDE Education Project | KWordQuiz Format |
| KVW file extension | Google Inc. | Google Earth Workspace |
| KWB file extension | Vincent Peters | Kwalitan Work |
| KWD file extension | KDE | KWord Document Format |
| KWF file extension | Embarcadero Technologies, Inc. | Delphi Pascal Chart |
| KWL file extension | N/A | KWalletManager |
| KWM file extension | WebMoney | WebMoney Key Format |
| KWP file extension | Kamban Software | Kamban Document |
| KWREPLAY file extension | Electronic Arts | Command & Conquer 3 Replay Format |
| KWS file extension | KeyWallet GbR. | KeyWallet Skin |
| KXX file extension | Tavultesoft | Custom Keyman Engine Product |
| KYB file extension | N/A | Keyboard Layout Format |
| KYN file extension | ESTsoft Corp. | ALSee Thumbnail Cache |
| KYR file extension | IBM | Lotus Domino Key Ring Format |
| KYS file extension | Adobe Systems | Adobe Keyboard Shortcut Format |
| KZ file extension | KuaiZip.com | KuiaiZip Archive |
| KZM file extension | KARIZMA | Karizma Designer Album |
| KZX file extension | Solid Iris Technologies | Kerkythea Material |
Web Developer acting on his own, author of Internet solutions facilitating working with new technologies for less advanced users. Internet maniac.
