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 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. 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 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 (Océ 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

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