Collector: Nosa Lee
Original Address: https://www.seeksunslowly.com/file-extensions-types-references-j
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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 J*, 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

J   JPEG / JFIF Image
J   JAR Compressed File
J   Java Source Code (Sun)
J1   EDIT Compiler JEDEC Boundary File
J2A   Jazz Jackrabbit 2 Animation Library (Epic MegaGames Inc.)
J2B   Jazz Jackrabbit 2 Music File (Epic MegaGames, Inc.)
J2D   Jazz Jackrabbit Data File (Epic MegaGames, Inc.)
J2E   Jazz Jackrabbit 2 Episode File (Epic MegaGames, Inc.)
J2G   J2 Fax File
J2H   Jazz Jackrabbit 2 High Scores (Epic MegaGames, Inc.)
J2I   Jazz Jackrabbit 2 Internet Server Link (Epic MegaGames, Inc.)
J2K   JPEG-2000 JP2 File
J2L   Jaxx Creation Station Level File (Epic MegaGames Inc.)
J2M   Jazz Jackrabbit 2 Recorded Macro (Epic MegaGames, Inc.)
J2S   Jazz Jackrabbit 2 Language Data (Epic MegaGames, Inc.)
J2T   Jazz Jackrabbit 2 Tile Set (Epic MegaGames, Inc.)
J2V   Jazz Jackrabbit 2 Cinematic File (Epic MegaGames, Inc.)
J62   Ricoh Digital Camera File
J6I   Ricoh Digital Camera File (Ricoh Co., Ltd.)
J92   Javelin Configuration File (Minisoft Inc.)
JA   Trainz Railroad Simulator Game Content (Auran Games)
JA   IBM Tools Updater File
JACKET   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JACKSUM   Jacksum Fingerprint (Dipl.-Inf. (FH) Johann N. L鰂flmann)
JAD   Java Application Descriptor File (Sun Microsystems, Inc.)
JAG   Jaguar Server File
JAIL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAM   Joaquim-Andrew-Mats Message Base Proposal
JAM   E-mail
JAM   FTN Software Jam Messagebase
JAM   JamTracker Music Module
JAM   Image Microprose
JAM   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAM2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAMMIX   Jammix Enhacer Music Transform File (Danilics Tibor)
JAN93   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAP   JAlbum Project File (Datadosen)
JAP   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAP   Fifa World Cup Game Data fe Art Legalscr File
JAPAN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAR   JARCS Compressed Archive (JPMdL Archival System)
JAR   JAR Archive (ARJ Software, Inc.)
JAR   Java Archive (Sun Microsystems, Inc.)
JAR   Java Applet (Sun)
JARRE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAS   Paint Shop Pro Compressed Graphic (Corel Corporation)
JASC   JAS Compressed Graphic
JAU   Jauge
JAV   Java Source Code (Sun)
JAVA   Java Source Code (Sun)
JAW   IchiTaro Web Japanese Extended WordProcessor (Justsystem Corporation)
JB2   JBIG2 Bitmap Graphic
JBA   Jabaco Source Code Programming Language (Jabaco)
JBB   JobEditor32 Binary Job Data (Motoman Inc.)
JBC   BestCrypt Container (Jetico, Inc.)
JBC   Jam Byte-Codec File
JBD   SigmaScan Data File
JBF   Paint Shop Pro Browser Cache (Corel Corporation)
JBF   Backup Now Backed Up File (JetSoft Corporation)
JBG   JBIG File
JBI   JobEditor32 ASCII Job Data (Motoman Inc.)
JBIG   JBIG File
JBIG2   JBIG2 Bitmap Graphic
JBK   Jot + Notes Backup File for Older Version (King Stairs Software)
JBK   Juno Backup File
JBL   Doom Scene Add-in (Id Software, Inc.)
JBP   DJ Jukebox Project
JBR   Paint Shop Pro Brush (Corel Corporation)
JBS   DesignArt Vector Graphic (Oc� N.V.)
JBX   Project Scheduler File
JC   FlashGet Intermediate Download (Beijing Zhitongwuxian Tech, Ltd.)
JC   Watcom Source File
JC!   FlashGet Incomplete Download (Beijing Zhitongwuxian Tech, Ltd.)
JCAMP   Misc
JCB   CB-JCBrooke Song/Module
JCC   Japan Crossword Dmitry Torshin Format File (EliteWare)
JCC   Code Crusader Project Data (New Planet Software)
JCD   FlashGet Download Database File (Beijing Zhitongwuxian Tech, Ltd.)
JCE   JWPce (Glenn Rosenthal)
JCF   JAWS for Windows Configuration File (Freedom Scientific)
JCK   Liquid Motion JACK Scene Description
JCL   Job Control Language IBM
JCM   Java Commerce Message Commerce Message (Wallet) (Sun)
JCP   Jesusonic Preset (Cockos Incorporated)
JCS   Flashget Script HTML Table
JCS   Latest Bruker WinSpecEdit v3.08 JCAMP
JCV   Baseball/Golf Analyzer (JC Video Systems)
JD   Jigsaw Terminal File
JDA   Winphone Fax Send Journal
JDB   Norton AntiVirus Update File (Symantec Corporation)
JDB   Siren Jukebox
JDB   Winphone Fax Receive Journal
JDBG   Project JEDI Embedded JCL Debug Information (Project JEDI)
JDE   Cariverona
JDF   JAWS for Windows Voice Synth File (Freedom Scientific)
JDF   Turok 2 Game File
JDF   Job Definition Format Job File
JDT   Capture Classic Filler (Accelio)
JDX   JSpell UNICODE Dictionary (Page Scholar Inc.)
JDX   J Database Exchange (JDX) O/R Mapping Specification (Software Tree, Inc.)
JDX   EDICT Index
JDX   JCAMP Chemical Spectroscopic Data Exchange Format (MDL Information Systems, Inc.)
JED   Xilinx Integrated Software Environment Device Configuration Information (Xilinx, Inc.)
JED   JEDEC Programming Specification
JEF   Janome NH10000 Sewing Machine Stitch File (Janome America, Inc.)
JEQ   Jet Audio Saved Equalizer Setting (JetAudio, Inc.)
JESD   JZEasyText Word Processor Save File (JamesZhu Inc.)
JET   Jetpack User-created Level Map
JET   Hybrid JetFax Fax
JFD   FormWare Job
JFD   JAWS for Windows (Freedom Scientific)
JFF   JPEG Image
JFF   JAWS for Windows (Freedom Scientific)
JFG   jEEPers User Specific Information
JFI   JPEG/JIFF Image
JFIF   JPEG/JIFF Image
JFM   Capture Classic (Accelio)
JFX   J2 Fax File
JG6   BigJig Jigsaw (Lena Pankratova)
JGCSCS   EditPad Pro Custom Coloring Scheme (JGsoft – Just Great Software)
JGD   Paint Shop Pro Gradient (Corel Corporation)
JGF   Jetcam Geometry File (JETCAM International, Ltd.)
JGF   JAWS for Windows Configuration File (Freedom Scientific)
JGL   QWS3270 PLUS Session Layout File (Jolly Giant Software Inc.)
JGP   QWS3270 PLUS Session Parameter File (Jolly Giant Software Inc.)
JGS   QWS3270 PLUS Script (Jolly Giant Software Inc.)
JGW   Map File
JHTM   Dynamo Server Page
JHTML   Dynamo Server Page
JIF   Jeff’s Image Format Bitmap
JIF   JPEG/JIFF Image
JIG   Jigsaw Game (GameHouse, Inc., a division of RealNetworks, Inc.)
JIG   Living Scenes Jigsaw Puzzles (Carolina Road Software L.L.C.)
JIGDO   Jigsaw Download Download Instruction File (Richard Atterer)
JIGSAW   JIGSAW Explorer JIGSAW puzzle (Carolina Road Software)
JIM   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JINKS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JIS   Japanese Industrial Standard Text File
JJ   C64 Doodle Compressed File
JJ   JavaCC File
JJC   Canvas Compressed Audio File
JJF   Jester Jugglor File
JKL   Jedi Knight
JKM   JAWS for Windows Configuration File (Freedom Scientific)
JKS   Jedi Knight Backup
JKS   keytool Java Keystore (Sun Microsystems, Inc.)
JL   Sawfish Lisp-based Script
JLA   VisualPro BMP Image
JLAB   JLab Program Source Code (Linova)
JLC   Sawfish Byte Compiled Lisp-based Script
JLF   JetLinks Bookmark Managment
JLP   JLIP Video Capture (Video Producer) Index Format Display (JVC)
JLS   JAWS for Windows (Freedom Scientific)
JLS   JPEG-LS File
JMA   Super Nintendo NSRT Compressed Game (Nintendo)
JMAN   Illum Source Irohaserver File
JMD   Paint Shop Pro Image Map Settings (Corel Corporation)
JMF   Java Multimedia File (Sun)
JMG   16 Bit Adaptive RLE Compressed Bitmap
JMH   JPEG File Interchange Format
JMK   Code Crusader Build Script (New Planet Software)
JMM   Digital Camera Video Clip (JVC)
JMP   SAS JMP Discovery Chart-to-Statistics File (SAS Institute Inc.)
JMS   SpamProx Blocking List (Dewqs’ Tribes)
JMS   Voxtron TeleButler Graphical Voice Response Call Flow
JMS   UltraForce Music Format
JMX   JMeter File
JN1   Epic MegaGames Jill of the Jungle Data File
JNB   SigmaPlot Workbook File (SYSTAT Software Inc.)
JNC   Communication Log File
JNG   JPEG Network Graphic Bitmap
JNGL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JNK   Junk
JNL   Journal Macro Data File (Chosen Software)
JNL   Ingres Journal File (Computer Associates International, Inc.)
JNL   ISC BIND Journal File (Internet Systems Consortium)
JNL   WINDEV Log File (PC SOFT)
JNLP   Java Web Start (Sun Microsystems, Inc.)
JNT   Windows XP Tablet PC Edition Journal (Microsoft Corporation)
JOB   Windows Task Scheduler Task Object (Microsoft Corporation)
JOB   Survey Pro Job (Tripod Data Systems)
JOB   Systems Management Server (SMS) Job File (Microsoft Corporation)
JOB   QuestVision Vector Graphics File
JOB   MicroSim PCBoard External ASCII Job File
JOB   Job File
JOB   File Invesigator Script Commands
JOB   MetaCAM Nest Job (Metamation, Inc.)
JOB   BETA 44 Job File
JOB   AI Research
JOBOPTIONS   Acrobat Job Options File (Adobe Systems Incorporated)
JOBS   VirtualDub Job Control File (Avery Lee)
JOC   Context4 DOS Word Processor File
JOCL   Java Object Configuration Language
JOD   MS.Jet.OLEDB.4.0 Related File
JOI   Xboard Join Conferences File
JOINED   HJSplit Default Joined File (Freebyte.com)
JOKE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JONES   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JOR   SQL Server Journal File (Microsoft Corporation)
JOR   Gupta SQLWindows Journal
JOT   JDesignerPro File
JOT   Jot + Notes Note Data File (King Stairs Software)
JOT   WinJottr Desktop Note
JOU   VAX Edt Editor Journal File
JOURNAL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JOY   Trackjoy GUS Tracker Module
JOY   Joystick Calibration File
JP2   Jeoparty II Presentation (Matthew Hagaman)
JP2   JPEG-2000 JP2 File
JP3   Electric Quilt File
JP4   Electric Quilt File
JP5   Electric Quilt File
JPA   JoomlaPack Joomla Installation Backup (fronzenFX)
JPC   Japan Picture Format
JPC   JPEG-2000 Code Stream Bitmap
JPC   Jprobe Coverage Memory Snapshot (Quest Software Inc.)
JPE   JPEG/JIFF Image
JPEG   JPEG/JIFF Image
JPEGENX   egis Encrypted JPEG File (HiTRUST Inc.)
JPF   Biz Plan Pro Business Plan Contents (JIAN Tools For Sales, Inc.)
JPF   Mass Center Main Mass Spectrometry Data (JEOL USA, Inc.)
JPG   CompactDRAW e-JPG Graphic (MediaChance)
JPG   JPEG/JIFF Image
JPGENX   egis Encrypted JPG File (HiTRUST Inc.)
JPG_T   JPG Image File
JPH   Jprobe Memory Debugger Memory Snapshot (Quest Software Inc.)
JPI   Jupiter Document (Elfin Sp. z o.o.)
JPL   Jprobe Settings File (Quest Software Inc.)
JPL   Siren Jukebox
JPM   LuraDocument.jpm Compressed PDF File (Algo Vision LuraTech GmbH)
JPN   Photomodeler Lite File
JPOW   JPowered Java Bar Charts
JPP   Jprobe Profiler Memory Snapshot (Quest Software Inc.)
JPP   Jigsaw Puzzle Player Puzzle Definition (B&P Games B.V.)
JPR   Oracle JDeveloper Model JProject
JPR   Javasockets File
JPS   Stereo Image
JPS   Jigsaw Puzzle Player Puzzle Completion Status (B&P Games B.V.)
JPS   Print Studio Graphic (Jolly, Inc.)
JPT   Jprobe Threadalyzer Memory Snapshot (Quest Software Inc.)
JPT   Print Studio Template (Jolly, Inc.)
JPX   JBuilder Project File (Borland Software Corporation)
JPX   JPEG-2000 JP2 File
JPX   JAlbum jalbum image info
JQX   Windows Help Related File (Microsoft Corporation)
JQZ   JQuiz Quiz File
JR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JR2   FishSim Add-on (J.C.Spooner)
JRC   Jrchive Compressed Archive
JRF   The Jumbot Bot Level Navigation File
JRF   winIDEA Workspace (Programming Project File) (iSYSTEM AG)
JRL   BioWare Aurora Engine Journal (BioWare Corp.)
JRL   Top Secret Crypto Gold Top Secret Journal File (TAN$TAAFL Software Company)
JRP   Pg4uw Job Report File (Elnec s.r.o.)
JRP   Electric Quilt File
JRXML   JasperReports JRXML Report Definition (JasperSoft Corporation)
JS   JetScript Output File
JS   JACOsub Script
JS   Mozilla (Netscape) Settings (Mozilla.org)
JS   JavaScript Source Code
JSB   JAWS for Windows Script Binary File (Freedom Scientific)
JSB   JavaScript Bean (JSB) File
JSCRIPT   GoLive JavaScript (Adobe Systems Incorporated)
JSD   JAWS for Windows Script Documentation File (Freedom Scientific)
JSD   Paint Shop Pro Image Slice Settings (Corel Corporation)
JSD   eFAX Jet Suite Document (j2 Global Communications, Inc.)
JSD   Join-Split File
JSDB   JumpStart Database (Jumpstart-it.com)
JSE   JScript Encoded Script File
JSE   Fichier Encoded Javascript
JSF   Macromedia Fireworks Batch Script
JSF   Jahshaka Scene File (The Jahshaka Project)
JSFL   Flash Javascript (Adobe Systems Incorporated)
JSH   JAWS for Windows Script Header File (Freedom Scientific)
JSL   Paint Shop Pro Shapes File (Corel Corporation)
JSL   Visual J# Code (Microsoft Corporation)
JSM   JAWS for Windows Script Message File (Freedom Scientific)
JSM   Jig ShapeMap (Steamboat Software)
JSM   JugWin Jigsaw
JSM   Gray Design Associates Jigsaws Galore Jigsaw File
JSML   JSim Markup Language File (University of Washington)
JSN   Shield Now Shield File (JetSoft Corporation)
JSO   Various Programs JISO Compressed Disk Image File
JSON   Google Gears Manifest File (Google)
JSON   Firefox Bookmark Backup (Mozilla)
JSON   JavaScript Object Notation
JSP   Java Server Page (Sun)
JSP10   Java Server Page (Sun)
JSPA   WebWork Framework JSP Action
JSPF   JSP Page Fragment (Sun)
JSRC   Jabaco Source Code Programming Language (Jabaco)
JSS   JAWS for Windows Script Source File (Freedom Scientific)
JSS   JugWin Jigsaw
JSS   JSheet
JSS   Gray Design Associates Jigsaws Galore Saved Game Jigsaw File
JST   Code Crusader Symbol Database (New Planet Software)
JST   Jnes Saved Game State File (JaboSoft)
JSV   Java Structure Viewer
JSV   VXML JavaServer Page
JSV   Japanese Flash Card File
JSV   HyperRail 3D Coaster Design Construction File
JSW   WML JavaServer Page
JSX   After Effects Script File (Adobe Systems Incorporated)
JT   JT Fax
JTD   Ichitaro Document (Justsystem Corporation)
JTF   Hayes JT Fax
JTF   JPEG Tagged Interchange Format Image
JTIF   JPEG Tagged Interchange Format Image
JTK   Java ToolKit File (Sun)
JTL   JTool Data File (Behavioral Health Quality)
JTP   Windows XP Tablet PC Edition Journal (Microsoft Corporation)
JTP   JetForm File
JTR   Jelbert GeoTagger Location Database (Jelbert Consulting)
JUDI   JudoScript Source Code File (JudoScript.COM)
JUDO   JudoScript Source Code File (JudoScript.COM)
JUL   Inteliweb Program Registration and Validation (InVision Marketing, Inc. & Inteliweb.net)
JUL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JUMP   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JUMP1   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JUN14   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JUP   Code Crusader User-Specific Project Preferences (New Planet Software)
JURL   JustUrls Button File (Eastern Digital Pty. Ltd.)
JUST   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JUT   Jutvision Scene
JVC   Digital Camera File
JVS   Jpeg Video Sequencer Sequenced JPEG Images
JVSG   IP Video System Design Tool IP Video System Design Tool (CCTV Design Software)
JW   MS Wordpad, Works for windows v3.0 & 4.0
JW   Jigsaw Terminal File
JW   Justwrite Text
JW   Legacy Version 1.1
JW   Q & A Write for Windows 3.0
JWC   JewelCase Maker Saved File (NewTech Infosystems Inc.)
JWC   Jw_cad Data (Jiro Shimizu & Yoshifumi Tanaka)
JWL   Easy CD Creator’s CD Label (Sonic Solutions)
JWL   Justwrite Text File Library
JWL   Jewel Case Creator CD Disc Case
JWP   JWP Document
JWP   Easy CD Creator Label File (Sonic Solutions)
JWR   LegaSuite GUI J Walk Runtime File (Seagull Software Systems, Inc.)
JWS   WebLogic Workshop Java Web Services (BEA Systems, Inc.)
JXDM   Multi-Channel Server (MCS) Markup Editor Java Server Page with XDIME Markup/Java Code (Volantis Systems Ltd.)
JXT   Daqarta Extended Audio Data (Interstellar Research)
JXX   C++ Header File
JZ   JamesZhu Internet Browser Database File (JamesZhu, Inc.)
JZZ   Jazz Spreadsheet

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  Number  Symbol

Download All File Types/Extensions in ONE Compressed File

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