Alphabetic File Extension List

The file extension list you requested is shown on this page. It loads as a table so please give it a moment as some of the lists are quite long. These lists contain basic information: the extension, the name of the program it works with, the specific function of the file, and the company that makes the program. Not all extensions have all of the data. Click on the extension of interest to see the detail page for that extension. Total extensions in this particular list: 346.

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Extension Information
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 IBM Tools Updater File
JA Trainz Railroad Simulator Game Content (Auran Games)
JACKET Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JACKSUM Jacksum Fingerprint (Dipl.-Inf. (FH) Johann N. Löfflmann)
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 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAM E-mail
JAM FTN Software Jam Messagebase
JAM Image Microprose
JAM JamTracker Music Module
JAM Joaquim-Andrew-Mats Message Base Proposal
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 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAP Fifa World Cup Game Data fe Art Legalscr File
JAP JAlbum Project File (Datadosen)
JAPAN Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JAR Java Archive (Sun Microsystems, Inc.)
JAR JAR Archive (ARJ Software, Inc.)
JAR JARCS Compressed Archive (JPMdL Archival System)
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 Juno Backup File
JBK Jot + Notes Backup File for Older Version (King Stairs Software)
JBL Doom Scene Add-in (Id Software, Inc.)
JBP DJ Jukebox Project
JBR Paint Shop Pro Brush (Corel Corporation)
JBS DesignArt Vector Graphic (Océ N.V.)
JBX Project Scheduler File
JC Watcom Source File
JC FlashGet Intermediate Download (Beijing Zhitongwuxian Tech, Ltd.)
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 Siren Jukebox
JDB Winphone Fax Receive Journal
JDB Norton AntiVirus Update File (Symantec Corporation)
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 EDICT Index
JDX JCAMP Chemical Spectroscopic Data Exchange Format (MDL Information Systems, Inc.)
JDX JSpell UNICODE Dictionary (Page Scholar Inc.)
JDX J Database Exchange (JDX) O/R Mapping Specification (Software Tree, Inc.)
JED JEDEC Programming Specification
JED Xilinx Integrated Software Environment Device Configuration Information (Xilinx, Inc.)
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 Hybrid JetFax Fax
JET Jetpack User-created Level Map
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 JAWS for Windows Configuration File (Freedom Scientific)
JGF Jetcam Geometry File (JETCAM International, Ltd.)
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 Living Scenes Jigsaw Puzzles (Carolina Road Software L.L.C.)
JIG Jigsaw Game (GameHouse, Inc., a division of RealNetworks, Inc.)
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 UltraForce Music Format
JMS Voxtron TeleButler Graphical Voice Response Call Flow
JMS SpamProx Blocking List (Dewqs' Tribes)
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 Ingres Journal File (Computer Associates International, Inc.)
JNL WINDEV Log File (PC SOFT)
JNL Journal Macro Data File (Chosen Software)
JNL ISC BIND Journal File (Internet Systems Consortium)
JNLP Java Web Start (Sun Microsystems, Inc.)
JNT Windows XP Tablet PC Edition Journal (Microsoft Corporation)
JOB AI Research
JOB BETA 44 Job File
JOB File Invesigator Script Commands
JOB Job File
JOB MicroSim PCBoard External ASCII Job File
JOB QuestVision Vector Graphics File
JOB Windows Task Scheduler Task Object (Microsoft Corporation)
JOB Survey Pro Job (Tripod Data Systems)
JOB MetaCAM Nest Job (Metamation, Inc.)
JOB Systems Management Server (SMS) Job File (Microsoft Corporation)
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 Gupta SQLWindows Journal
JOR SQL Server Journal File (Microsoft Corporation)
JOT JDesignerPro File
JOT WinJottr Desktop Note
JOT Jot + Notes Note Data File (King Stairs Software)
JOU VAX Edt Editor Journal File
JOURNAL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JOY Joystick Calibration File
JOY Trackjoy GUS Tracker Module
JP2 JPEG-2000 JP2 File
JP2 Jeoparty II Presentation (Matthew Hagaman)
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 Mass Center Main Mass Spectrometry Data (JEOL USA, Inc.)
JPF Biz Plan Pro Business Plan Contents (JIAN Tools For Sales, Inc.)
JPG JPEG/JIFF Image
JPG CompactDRAW e-JPG Graphic (MediaChance)
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 Siren Jukebox
JPL Jprobe Settings File (Quest Software Inc.)
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 Javasockets File
JPR Oracle JDeveloper Model JProject
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 Electric Quilt File
JRP Pg4uw Job Report File (Elnec s.r.o.)
JRXML JasperReports JRXML Report Definition (JasperSoft Corporation)
JS JACOsub Script
JS JavaScript Source Code
JS Mozilla (Netscape) Settings (Mozilla.org)
JS JetScript Output File
JSB JAWS for Windows Script Binary File (Freedom Scientific)
JSB JavaScript Bean (JSB) File
JSCRIPT GoLive JavaScript (Adobe Systems Incorporated)
JSD eFAX Jet Suite Document (j2 Global Communications, Inc.)
JSD JAWS for Windows Script Documentation File (Freedom Scientific)
JSD Join-Split File
JSD Paint Shop Pro Image Slice Settings (Corel Corporation)
JSDB JumpStart Database (Jumpstart-it.com)
JSE Fichier Encoded Javascript
JSE JScript Encoded Script File
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 Gray Design Associates Jigsaws Galore Jigsaw File
JSM JAWS for Windows Script Message File (Freedom Scientific)
JSM JugWin Jigsaw
JSM Jig ShapeMap (Steamboat Software)
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 JavaScript Object Notation
JSON Firefox Bookmark Backup (Mozilla)
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 Gray Design Associates Jigsaws Galore Saved Game Jigsaw File
JSS JAWS for Windows Script Source File (Freedom Scientific)
JSS JSheet
JSS JugWin Jigsaw
JST Jnes Saved Game State File (JaboSoft)
JST Code Crusader Symbol Database (New Planet Software)
JSV HyperRail 3D Coaster Design Construction File
JSV Japanese Flash Card File
JSV Java Structure Viewer
JSV VXML JavaServer Page
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 JetForm File
JTP Windows XP Tablet PC Edition Journal (Microsoft Corporation)
JTR Jelbert GeoTagger Location Database (Jelbert Consulting)
JUDI JudoScript Source Code File (JudoScript.COM)
JUDO JudoScript Source Code File (JudoScript.COM)
JUL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
JUL Inteliweb Program Registration and Validation (InVision Marketing, Inc. & Inteliweb.net)
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 Jigsaw Terminal File
JW Justwrite Text
JW Legacy Version 1.1
JW MS Wordpad, Works for windows v3.0 & 4.0
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 Jewel Case Creator CD Disc Case
JWL Justwrite Text File Library
JWP Easy CD Creator Label File (Sonic Solutions)
JWP JWP Document
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

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