Collector: Nosa Lee
Original Address: https://www.seeksunslowly.com/file-extensions-types-references-k
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Now, I collected all the known file extensions/types for your reference, I grouped them according to the first character due to there are too many file extensions/types.

The following file extensions/types are grouped as K*, to refer to more file extensions/types or download them (a compressed txt file that separates the extension and description with ” : “), please click the following links.

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Number  Symbol

Download All File Types/Extensions in ONE Compressed File

K : IRIS Editor Format File (eurobraille)
K : Desktop Color Separation Specification Black Layer
K : NRJ Live File
K00 : Tonline DB File
K01 : Tonline DB File
K01 : Clarion DOS Database Key File (SoftVelocity)
K02 : Clarion DOS Database Key File (SoftVelocity)
K02 : Tonline DB File
K03 : Clarion DOS Database Key File (SoftVelocity)
K03 : Tonline DB File
K04 : Clarion DOS Database Key File (SoftVelocity)
K05 : Clarion DOS Database Key File (SoftVelocity)
K06 : Clarion DOS Database Key File (SoftVelocity)
K07 : Clarion DOS Database Key File (SoftVelocity)
K08 : Clarion DOS Database Key File (SoftVelocity)
K09 : Clarion DOS Database Key File (SoftVelocity)
K1S : Wave Glib19 File
K2 : Kar2ouche Storyboard File
K25 : Kurzweil 2500 Sample (Kurzweil Music Systems, Inc.)
K25 : Kodak DC25 Digital Camera File
K3D : 3DS Macro Language Description
K4E : Karaoke 4 Everyone.com Player/Editor File (Karaoke 4 Everyone.com)
K7 : DCMO6 Emulator Tape Image
KA : Karma Asset
KAF : Resurrection Matchmaker! MapPack (Wildman-Productions)
KAL : Sfkal Calender Kal_40 File
KAL : KManager Calibration Data File (Hondata, Inc.)
KAN : Kwalitan Annotation (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KAP : MapInfo Sea Chart (MapInfo Corporation)
KAR : Keep-It Archive (Remember International Associates Ltd)
KAR : Karaoke MIDI File
KAR : FOX+ 2.0
KAT : Katorzer Music Composition
KAU : KeyAudit Software Audit
KAW : Karma Workspace
KB : Knowledge Pro Source Code
KB : C++ Keyboard Script (Borland Software Corporation)
KBD : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KBD : Keyboard Script File Layout (Microsoft Corporation)
KBD : Dungeon Lords Game Data (Typhoon Games (HK) Ltd.)
KBF : MyInfo Documnet/Outline (Milenix Software)
KBI : Keirsey-Bates Temperament Sorter Index
KBM : Reflection Keyboard Script File Layout
KBM : Scala Keyboard Mapping
KBN : TeamSpeak Keybinding File (TeamSpeak Systems)
KBP : Keirsey-Bates Temperament Sorter Profile
KBR : Keirsey-Bates Temperament Sorter Data
KBR : The Drums Pro file
KBS : ACE Studio Model Builder
KBX : AVG Keyboard Shortcut Definitions (AVG Technologies)
KBX : KBOX Heroes Factory File (KBOX Team)
KCC : KeywordConvert Keyword/Phrase Combine List (FormatBlue Software)
KCF : KiSS Configuration File
KCF : Sony Ericsson Remote Control Configuration
KCH : KChess Notation File (Ark Angles)
KCL : KeywordConvert Keyword/Phrase List (FormatBlue Software)
KCL : Kyoto Common LISP Source Code
KCM : K鰊yvCalc File (MM.sys Sz醡韙醩technikai Bt.)
KCO : Kwalitan Codes (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KCP : Keychamp File
KCT : Kwalitan Categories (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KDB : kusziDataBase Database File (kusziNET)
KDB : kinodb File (datb)
KDB : Doobs Database (Kyuran’s World)
KDB : KeePass Password Database (ver 1.x) (Dominik Reichl)
KDBX : KeePass Password Database (ver 2.x) (Dominik Reichl)
KDC : Kwalitan Document (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KDC : Kodak RAW Bitmap Image (Eastman Kodak Company)
KDELNK : KDE Desktop
KDEVELOP : KDevelop Global Project Configuration Information (KDevelop Team)
KDEVPRJ : KDevelop Project File (KDevelop Team)
KDEVSES : KDevelop Specific Behavior Configuration File (KDevelop Team)
KDF : Kinkos Photo (Kinko’s, Inc.)
KDF : VisiQuest (Khoros) Standard Data Format (AccuSoft)
KDH : CAJViewer
KDK : Kodak Proprietary Decimated TIFF Format
KDO : Kudo Picture Browser
KDT : Medbasin Evaporation Data (National Technical University of Athens, Laboratory of Reclamation Works & Water Resources Management)
KDW : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KE$ : Modem Bitware Fax Disk2 File
KED : KEDIT Profile and Macro File
KEN : Player CDcheck Compressed File
KEP : SapShow Training File (SAP)
KEP : Turbo Pascal DOS TP19 Compressed Kepler File (Borland Software Corporation)
KERNEL : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KES : Kurzweil 1000 and 3000 Accessible Documents (Kurzweil Educational Systems, Inc.)
KEV : JAWS for Windows Preload File (Freedom Scientific)
KEX : Haxial KRE KRE Executable (Haxial Software Pty Ltd.)
KEX : KEDIT Macro File
KEXI : Kexi Native Database File (KDE e.V.)
KEXIS : Kexi Database Connection Parameter File (KDE e.V.)
KEXT : Mac OS X Kernel Extension (Apple Inc.)
KEY : Sentry 2020 Encryption File
KEY : Program Security or Registration File
KEY : National Construction Estimator 32 Costbook Key File
KEY : TBAV File
KEY : Top Secret Crypto Gold (TAN$TAAFL Software Company)
KEY : AntiVir PersonalEdition License Key File (AntiVir PersonalProducts GmbH)
KEY : Avira Product Key (Avira GmbH)
KEY : Keynote Presentation Wrapper Folder (Apple Inc.)
KEY : Business Key Accounting File (Universal Systems)
KEY : BioWare Aurora Engine Resource File (BioWare Corp.)
KEY : Notes 5 Full Text Index (IBM)
KEY : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KEY : Kaspersky Anti-virus Toolkit Key File (Kaspersky Lab)
KEY : Keyboard Definition File
KEY : Infinity Game Engine Directory of Resources, Locations and Types (BioWare Corp.)
KEY : FractInt Demo Script
KEY : ArcView Geocoding Matching Keys (ESRI)
KEY : DataCAD Icon Toolbar File (DATACAD LLC)
KEY : OS/2 Archive .KEY-file
KEY : Diablo II Key File (Blizzard Entertainment)
KEY : Forecast Pro Datafile
KEY1 : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KEYBOARD : Amaya Configuration
KEYCHANGER : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KEYNOTE : iWork Keynote File (Apple Inc.)
KEYS : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KE_ : Ntgraph Ze32v215 File
KF2 : Max Payne Model File (Rockstar Games)
KFA : Dark Age of Camelot Animation
KFA : IRIS Shortened Format (eurobraille)
KFI : IRIS Native Data File (eurobraille)
KFL : Pegasus Mail Auto-Reply Memory File (David Harris)
KFL : Kwalitan Filter (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KFL : KFLog Airfield File
KFL : IRIS Literary (eurobraille)
KFM : KEY Form Designer Form Design (Broderbund)
KFM : GameBryo KFM File (Emergent Game Technologies)
KFN : KaraFun Karaoke Song (RECISIO S.A.R.L.)
KFP : Kinkos File Prep Tool
KFS : Pegasus Mail Static Kill File (David Harris)
KFS : Max Payne Model File (Rockstar Games)
KFT : Matrox X Tools Keyframe (Matrox Electronic Systems Ltd.)
KFX : KoFax Group 4 Image
KFX : 2D Graphic
KGB : Z80 Spectrum Emulator Snap/File Format
KGB : KGB Archiver Compressed Archive (Tomasz Pawlak)
KGB : Kremlin Encrypt File
KGP : Image
KHD : ViewChoice (Payroll Associates, LLC)
KHF : Kwalitan Tree Structure (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KHS : Kwalitan History (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KHTMP : Google Earth Temporary Object Location (Google)
KIC : Kodak Image Compression File (Eastman Kodak Company)
KICK : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KICK3 : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KID : Tonline Bsw4 Install Mdmimp File
KID : Kidspiration (Inspiration Software, Inc.)
KID : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KIF : Knowledge Interchange Format Draft Proposition
KIF : AutoCAD Key Index (Autodesk, Inc.)
KIK : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KIL : Interview File
KILLER : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KIM : Commodore KIM-1 Program Image File
KIN : Kinemage Chemical Protein Language
KIP : OA-KIP Client Data Transfer File (van Ovost Automatisering b.v.)
KIT : Raven Toolkit File
KIT : 20-20 Design Kitchen Design (20-20 Technologies)
KIT : Battery Drum Kit (Native Instruments)
KIT : Power Chord Drum Kit
KITCHEN : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KITTEN : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KIX : KiXtart Script
KIZ : UUencoded File
KIZ : Kodak Digital Postcard File
KJV : TheWord & Bible Companion King James Version Bible
KK1 : ViewChoice (Payroll Associates, LLC)
KK2 : ViewChoice (Payroll Associates, LLC)
KKT : TTSKONE
KKW : RoboHELP Keyword Help Project Index File
KL : Haxial Compiler Haxial KL Source File (Haxial Software Ltd.)
KLA : KLARFF Map Data
KLB : Klemmbretter
KLB : GraphicWorks Album
KLD : Dungeon Keeper 2 Playable Map (Electronic Arts, Inc.)
KLI : KalKulator Linear Algebra File
KLIP : KlipFolio Klip (serence inc.)
KLN : COLOGNE Multilingual Transliteration Scheme
KM : BMC Software Patrol File
KM : COOL Biz Database Diagram (Sterling Software, Inc.)
KM2 : ActiveModeler Professional Process Map (KAISHA-Tec Co. Ltd.)
KM3 : Kernel MetaMetaModel
KMA : Correlate K-Map Structure (Correlate AS.)
KMA : Video Hoster Karaoke File (Micro Technology Unlimited)
KMA : Kodak Memory Album (Kodak)
kmap : lyx Keymap
KMC : Correlate (Correlate AS.)
KMD : AIMAX Keyboard Macro (TA Engineering)
KMD : Model Browser File (Metis)
KMD : Media Desktop File (Kaaza)
KMD : ABSTAT for Windows Batch File (AndersonBell Corp)
KMD : Clicker Module Output
KMDR : Kommander (KDE Web Dev Team)
KMF : Kwalitan Memo (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KML : Google Earth Placemark (Google)
KML : Emu48 Emulator Keyboard Configuration File
KML : Kedit Macro Library
KML : Keyhole Placemark (Google)
KML : HP48 Emulator Win48 Script
KMN : SIL Hebrew Font System Keyboard
KMP : Knowledge Manager Knowledge Base Compressed Map (Hypersoft-net)
KMP : Correlate K-Map KnowledgeMap (Correlate AS)
KMP : Korg Trinity KeyMaP File
KMP : Ketchum Media Player Playlist (Ketchum Software Inc.)
KMP : KORG Trinity/Triton Multisample (KORG)
KMS : Model Browser Shortcut (Metis)
KMS : Correlate Solution Topics (Correlate AS.)
KMV : Model Browser File (Metis)
KMY : KMyMoney Decompressed XML Data
KMZ : Google Earth Saved Working Session (Google)
KMZ : Correlate K-Map Zipped KnowledgeMap (Correlate AS)
KM_ : Seqmax Seqprest Compressed Audio File
KND : NEPLAN NEPLAN-DOS Import/Export File (BCP Busarello + Cott + Partner Inc.)
KNF : Universal Flat Knitting Machine Pattern Design
KNF : Orchida Knitting System (Orchida Soft)
KNF : Personal Knowbase Custom Import Filter (Bitsmith Software)
KNN : Clarion for Windows Database Key (SoftVelocity)
KNO : Personal Knowbase Data (Bitsmith Software)
KNOW : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KNT : KeyNote Note File (Marek Jedlinski)
KNW : Known Problems
KO : IBM/Tools/Updater File
KOA : Koala Paint C64 Bitmap
KOD : Code
KOE : Turbo Pascal DOS File (Borland Software Corporation)
KOK : DEL MP3 Karaoke
KOM : Kit-O-Mat 3D Model File (KingMill Enterprises LLC)
KON : Konfabulator Widget Code (Konfabulator)
KOR : Korean Text File
KOR : Correction File
KOS : MicroType Pro Document
KOSIMA : Kosima File
KOURSE : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KOZ : Sprint Music Store Music Download for Phone (Sprint Nextel)
KPD : Kapital Database File (K Software)
KPF : Komodo Project File (ActiveState Software)
KPF : Kapere
KPG : Kai’S Power Goo Graphic
KPJ : K Database Magic Project File (Sandor Kovacs)
KPL : Kazaa Playlist
KPL : KPL Source Code
KPP : SmartPad Toolpad
KPP : Kudo Place Pack, Place Module
KPP : Kid Pix Deluxe Slide Show (Broderbund)
KPPX : Keypoint Presentation (Digitalsoft)
KPR : KPresenter Slide Show (KOffice Web Team)
KPR : Fifa World Cup Game Data Comon be File
KPR : Kwalitan Project (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KPS : IBM KIPS Bitmap
KPT : KPresenter Template (KOffice Web Team)
KPX : Kid Pix Deluxe Data File (Broderbund)
KQL : Kyle’s Quest Level Editor Graphic (Crimson Fire Entertainment)
KQP : Konica Quality Picture
KR1 : Kurzweil 2000 Sample (Kurzweil Music Systems, Inc.)
KRA : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KRA : Krita Image (The KDE Project)
KRACK : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KRACKS : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KRAK : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KRAW : BRSTM Audio Stream (Nintendo)
KRAW : Macintosh OS X Kernel-Raw Image Format (Apple Inc.)
KRC : Mouse and Key Recorder Recorded File (Kra-Tronic Corporation)
KRIS : Kris Tracker Format Song
KRISTAL : KRISTAL Audio Engine Project File (Kreatives.org)
KRK : Xbox Music Mixer Karaoke-enabled Music File (Microsoft Corporation)
KRK : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KRN : NBA99 Ice Hockey Foreground Font
KROMHE : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KRP : HiCAD 3D Part File (ISD Benelux B.V.)
KRX : Karaoke MIDI File
KRY : Herolab Krypten
KRZ : Kurzweil 2000 Sample (Kurzweil Music Systems, Inc.)
KS : Works Sheet (Microsoft Corporation)
KS : SOF Game File Log
KSC : KORG Trinity/Triton Script (KORG)
KSC : Korg Trinity Script
KSE : Keepsake Studio Export File
KSF : Kick it Up Stepfiles
KSF : KORG Trinity/Triton Sample (KORG)
KSG : Kwalitan Segment (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KSH : Prodigy Internet Registration File
KSH : Dazzle Dazzle Realization
KSH : UNIX Shell Script
KSHRC : UNIX Kom Shell Environment File
KSL : Karaoke Song List Creator Song List (Airwer)
KSM : Kefrens-Sound Machine Format Song
KSM : Embroidery File Format for Pfaff Machines
KSM : Ken Silverman Music Format
KSS : MSX Music File
KSS : K-ForCE Scoresheet File (Stephan Rakonza)
KSS : FabTrol MRP Template File (FabTrol Systems, Inc)
KSS : KDE [UNIX/Linux Desktop] Screen Saver (KDE)
KST : Olivetti Olitext Plus Script File
KSW : Kepler Scientific Workflows (Kepler Project)
KT2 : BATTERY 2 Drum Kit (Native Instruments)
KT3 : Battery 3 Battery 3 (Native Instruments)
KTE : FoilMaker Kite Design
KTH : Keynote Theme File (Apple Inc.)
KTI : Kelvin TOP-SET Investigator Investigation Data (The Kelvin Consultants Limited)
KTK : Kutoka’s Mia
KTP : Clarion for Windows Temporary Key File (SoftVelocity)
KTT : KeyText Data File
KTX : Kwalitan Text (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KU : Knowledge Explorer Knowledge Representation Knowledge Unit
KUMAC : Physics Analysis Workstation Macro File
KUP : Karaoke Song List Creator (Airwer)
KV3 : KM-NET Viewer Database (Kyocera Mita Corporation)
KVA : KVIrc Add-on (KVIrc Development Team)
KVB : Klick-N-View Business Cards
KVC : KVIrc Configuration (KVIrc Development Team)
KVQ : Sega Smash Pack PC Version File (Sega of America, Inc.)
KVS : KVIrc Script (KVIrc Development Team)
KVT : KVIrc Theme (KVIrc Development Team)
KVT : BASIC QuickBAS QuickB03 File
KVW : Google Earth Workspace (Google)
KW$ : NTgraph Visual C Wizzard File
KW3 : KanjiWORD Document (Pacific Software Publishing, Inc.)
KWB : Kwalitan Workfile (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KWB : KeyWord Braille File (Pulse Data International Ltd)
KWC : KeyWallet Compressed Skin (KeyWallet GbR)
KWD : KWord File (KWord Team)
KWD : Dungeon Keeper 2 Playable Map (Electronic Arts, Inc.)
KWD : Keyword
KWF : Kartex
KWF : Kwalitan Word List (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands)
KWF : Delphi Pascal Chart
KWI : Navigation System Data File (KIWI Format)
KWIC : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
KWO : KeyWallet Object (KeyWallet GbR)
KWS : KeyWallet Skin (KeyWallet GbR)
KWS : Kyocera Ringtone
KXS : Kexis Lossless Compressed Audio
KY : Peachtext List Manager (Peachtree Software (Sage Software SB, Inc.))
KYB : Keyboard Layout
KYE : Kye Game Data
KYF : Visual-Voice Mouth Movement File
KYS : Premiere Keys File (Adobe Systems Incorporated)
KYS : SourceOffSite Server Keys
KYS : Photoshop CS Keyboard Shortcut (Adobe Systems Incorporated)
KZM : Karizma Designer Album File (Karizma)
KZP : Kazoo3D or KazooStudio KazooPicture

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