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File Extensions

Files end in a "dot" and a two, three, or four letter file extension. The file extension tells you what type of file it is, what program uses that extension, and is used by your operating system to launch the appropriate program.

Select the first letter of the extension to jump to the appropriate section.
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 $ ~ 0 1 2 3 4 8 9 FTP

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- J -

JAS - Graphic

JFF - JFIF - JPEG File Interchange Format

JIF - JPEG Image Format - Graphic

JOB - Job file PROGRAM NAME: BETA 44

JOR - Journal file SQL

JPG - JPEG - Joint Photography Experts Group - Graphic

JT - JT Fax

JTF - JPEG graphic

JW - Text file PROGRAM NAME: JUSTWRITE

JWL - Text file Library PROGRAM NAME: JUSTWRITE

JZZ - Spreadsheet file PROGRAM NAME: JAZZ

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- K -

KBD - Keyboard layout PROGRAM NAME: IRMA WORKSTATION FOR WINDOWS

KBM - Keyboard layout

KDC - Kodak Photo Enhancer

KEX - Profile file PROGRAM NAME: KEDIT

KEY - Keyboard macros

KFX - PROGRAM NAME: Kofax

KYB - Keyboard layout

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- L -

L - LEX Program File

L - Link instructions

L - LISP Program File

LAB - Mailing Labels PROGRAM NAME: Q+E For MS EXCEL

LAY - Word chart layout PROGRAM NAME: APPLAUSE

LBG - Label generator PROGRAM NAME: DBASE IV

LBL - label PROGRAM NAME: dBASE IV / dBFAST / CLIPPER 5

LBM - Bitmap graphic PROGRAM NAME: DELUXE PAINT

LBO - Ordered Labels PROGRAM NAME: DBASE IV

LBR - screen driver PROGRAM NAME: LOTUS 1-2-3

LBR - Compressed Archive File PROGRAM NAME: LU

LBT - Label Memo PROGRAM NAME: FOXPRO

LBX - Label PROGRAM NAME: FOXPRO

LCF - Linker Control File PROGRAM NAME: NORTON GUIDES

LCN - Dictionary file PROGRAM NAME: WORDPERFECT

LD - Long Distance codes PROGRAM NAME: TELIX

LD1 - Overlay file PROGRAM NAME: dBASE

LDB - Locked DataBase file PROGRAM NAME: Microsoft Access

LEG - Document PROGRAM NAME: Legacy

LES - LESson PROGRAM NAME: Learn

LEX - Dictionary file PROGRAM NAME: Lexicon

LFT - LaserPrinter Font PROGRAM NAME: CHIWRITER

LGO - MS Windows Logo Driver PROGRAM NAME: MS WINDOWS

LHA - A DOS Compressed file

lha - PC/Amiga compression format PROGRAM NAME: LHA Expander or MacLHA

lhs - Literate Haskell Source file

LHW - Compressed Archive File Amiga PROGRAM NAME: LHWARP

lhz - LHA compression file

LIB - Program Library - diverse Programmer's Language

LIC - License file PROGRAM NAME: Shareware programs

LIF - Compressed Archive File

LIF - Logical Interchange Format - Data file PROGRAM NAME: Hewlett-Packard

LIN - Line Art PROGRAM NAME: AUTOCAD

LJ - Text file for HP LJ II Printer

LNK - Linker file

LOG - Log file

LRF - Linker Response File PROGRAM NAME: MS C/C++

LRS - Language Resource File PROGRAM NAME: WORDPERFECT FOR WINDOWS

LSP - LISP Program File PROGRAM NAME: XLISP

LST - LiST File on Installation disks PROGRAM NAME: MS-DOS

LWP - Document PROGRAM NAME: Lotus Word Pro

LZH - Compressed Archive File PROGRAM NAME: LHA / LHARC

LZS - Compressed Archive File PROGRAM NAME: LHARC

lzs - PC/Amiga compression format

LZW - Compressed Archive File Amiga PROGRAM NAME: LHWARP

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- M -

M - Function PROGRAM NAME: MATLAB

M - Macro Sourcecode PROGRAM NAME: BRIEF

M - PROGRAM NAME: MATHEMATICA

M3 - ModuleA 3 Program File

M3D - 3D Animation PROGRAM NAME: Corel

MA3 - Macro PROGRAM NAME: HARVARD GRAPHICS 3.0

MAC - Bitmap Graphic PROGRAM NAME: MACPAINT

MAC - Macro

MAF - Microsoft Access Form

MAK - Make file

MAK - Project file PROGRAM NAME: VISUAL BASIC

MAM - Microsoft Access Macro

MAN - Manual

MAP - Colorpalette

MAP - Format Data PROGRAM NAME: MICROGRAFX PICTURE PUBLISHER

MAP - Linker Map file

MAQ - Microsoft Access Query

MAR - Microsoft Access Report

MAS - Master data definition PROGRAM NAME: FOCUS

MAT - Microsoft Access Table

MAT - PROGRAM NAME: MATLAB

MAX - MAX Program File

MB - Memo Holder for Database PROGRAM NAME: PARADOX

MBK - Multiple index Backup PROGRAM NAME: DBASE IV

MBX - Message Base PROGRAM NAME: Eudora

MCC - Configuration PROGRAM NAME: MATHCAD

MCD - Document PROGRAM NAME: MATHCAD

MCF - Font PROGRAM NAME: MATHCAD

MCI - MCI Command Set

MCP - Printer driver PROGRAM NAME: MATHCAD

MCS - MathCAD format

MCW - Text file PROGRAM NAME: WORD For MACINTOSH

MD - Compressed Archive File PROGRAM NAME: MDCD

MDB - Database PROGRAM NAME: MS ACCESS

MDM - Modem definition PROGRAM NAME: TELIX

MDX - Multiple Index PROGRAM NAME: DBASE IV

ME - ASCII Text file

MEB - Macro Editor bottom overflow file PROGRAM NAME: WORDPERFECT

MED - Macro Editor delete save PROGRAM NAME: WORDPERFECT

MEM - Macro Editor macro PROGRAM NAME: WORDPERFECT

MEM - Memory file of Variables PROGRAM NAME: dBASE IV / FOXPRO

MEQ - Macro Editor print queue PROGRAM NAME: WORDPERFECT

MER - Macro Editor resident area PROGRAM NAME: WORDPERFECT

MES - Macro Editor work space PROGRAM NAME: WORDPERFECT

MET - Macro Editor top overflow file PROGRAM NAME: WORDPERFECT

MET - Meta file

MEU - Menu PROGRAM NAME: MS DOS Shell

MEX - Executable file PROGRAM NAME: MATLAB

MF - MetaFont Text file

MFF - MIDI File Format

MGF - Font PROGRAM NAME: Micrografx Draw

MI - Miscellaneous

MIC - Microsoft Image Composer

MID - MIDI File PROGRAM NAME: MS WINDOWS

MIF - MIDI Instrument

MIFF - PROGRAM NAME: ImageMagick

MIL - Group 4

MIME - Multipurpose Internet Mail Extension

MIX - Object file PROGRAM NAME: POWER C

MK - Makefile

MKE - Makefile PROGRAM NAME: MS WINDOWS SDK

MLB - Macro Library PROGRAM NAME: SYMPHONY, FOXPRO

MME - MIME encoded file

MMF - Microsoft Mail File

MMM - Animation PROGRAM NAME: Macromind

MND - Menu Program File PROGRAM NAME: AUTOCAD

MNT - Menu memo PROGRAM NAME: FOXPRO

MNU - Menu PROGRAM NAME: AUTOCAD / NORTON COMMANDER

MNX - compiled menu file PROGRAM NAME: AUTOCAD

MNX - Menu PROGRAM NAME: FOXPRO

MOB - Device definitions PROGRAM NAME: PEN WINDOWS

MOD - Audio file PROGRAM NAME: Amiga, PC, and Macintosh

MOD - ModuleA-2 Program File

MOD - Windows Kernel Module

MOV - Movie PROGRAM NAME: QuickTime

MOZ - Mozilla cache file PROGRAM NAME: Netscape

MP - PROGRAM NAME: Multiplan

MPC - Calender PROGRAM NAME: Microsoft Project

MPD - Mini port driver

MPE - MPEG - MPEG animation file

MPG - MPEG Animation

MPM - MathPlan Macro PROGRAM NAME: WORDPERFECT

MPNT - Macintosh MacPaint

MPP - Project file PROGRAM NAME: Microsoft Project

MPR - Program PROGRAM NAME: FOXPRO

MPT - Template file PROGRAM NAME: Microsoft Project

MPV - View PROGRAM NAME: Microsoft Project

MPX - Export file PROGRAM NAME: Microsoft Project

MPX - Compiler Menu PROGRAM NAME: FOXPRO

MRB - Multiple Resolution Bitmap Graphic PROGRAM NAME: MS C/C++

MRK - Markup PROGRAM NAME: Informative Graphics

MRS - Macro resource file PROGRAM NAME: WORDPERFECT FOR WINDOWS

MS - Checksum file for Anti-Virus PROGRAM NAME: MS-DOS

MSG - Message Text file in ASCII format

MSN - Microsoft Network document

MSP - Black-and-White Bitmap Graphic PROGRAM NAME: Microsoft Paint\Paintbrush

MST - Minispecification PROGRAM NAME: PROSA

MST - Setup script PROGRAM NAME: MS WINDOWS SDK

MSW - Text file PROGRAM NAME: MS WORD

MTH - Math PROGRAM NAME: DERIVE

MTW - Data file PROGRAM NAME: MINITAB

MU - Menu PROGRAM NAME: QUATTRO PRO

MUS - Music file

MVB - Database PROGRAM NAME: Microsoft Multimedia Viewer

MVF - Stop frame file PROGRAM NAME: AUTOCAD AUTOFLIX

MVI - Movie command file PROGRAM NAME: AUTOCAD AUTOFLIX

MXT - PROGRAM NAME: MS C

MYS - Saved game file PROGRAM NAME: Myst

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- N -

NB - Text file PROGRAM NAME: NOTA BENE

NCD - Norton Change Directory PROGRAM NAME: NORTON COMMANDER

NDX - Index PROGRAM NAME: dBASE / dBFAST

NET - Network Configuration PROGRAM NAME: HARVARD GRAPHICS FOR WINDOWS / PARADOX

NEW - New info

NG - Online-Documentation PROGRAM NAME: NORTON GUIDE

NLM - Program PROGRAM NAME: NetWare

NLS - National language support - Code Page

NOT - Notes PROGRAM NAME: IBM BOOKMANAGER

NST - Amima MOD Audio file

NTF - Notes PROGRAM NAME: IBM BOOKMANAGER

NTF - Notes Template File PROGRAM NAME: Lotus Notes

NTS - Tutorial PROGRAM NAME: NORTON

NTX - Index PROGRAM NAME: CLIPPER 5

NWS - Info Text file (latest news) (ASCII)

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- O -

O - Object file PROGRAM NAME: UNIX

O$$ - Outfile PROGRAM NAME: SPRINT

OAB - Outlook Address Book PROGRAM NAME: Microsoft Outlook

OAZ - Fax

OBD - Binder PROGRAM NAME: Microsoft Office

OBJ - Object Module

OCX - Object Linking and Embedding (OLE) Control Extension

OFF - Object File Format PROGRAM NAME: Vector Graphic

OFM - Font PROGRAM NAME: Adobe

OLB - Object Linking and Embedding (OLE) Object Library

OLE - Object Linking and Embedding Object

OLD - Backup

OLI - Text file PROGRAM NAME: Olivetti

ONX - Onyx Graphics Postershop

OPC - Job file PROGRAM NAME: BETA 44

OPT - Optimize PROGRAM NAME: QEMM

OPX - Organization diagram PROGRAM NAME: MS ORGCHART

ORI - Original

OUT - Output file

OV1 - Program file PROGRAM NAME: Overlay

OV2 - Program file PROGRAM NAME: Overlay

OV3 - Program file PROGRAM NAME: Overlay

OVL - Program Module file PROGRAM NAME: Overlay

OVR - Program Module file PROGRAM NAME: Overlay

OZM - Memo bank PROGRAM NAME: Sharp Organizer

OZP - Telephone bank PROGRAM NAME: Sharp Organizer

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- P -

P - PASCAL Program File

P - Picture PROGRAM NAME: APPLAUSE

P10 - Tektronix Plot10

PAB - Personal Address Book

PAD - Keypad definition PROGRAM NAME: TELEMATE

PAK - game data PROGRAM NAME: Quake

PAK - Compressed Archive File PROGRAM NAME: PAK

PAL - Color palette

PAR - Parameter file PROGRAM NAME: FRACTINT

PAS - PASCAL Program File

PAT - Hatch-Pattern PROGRAM NAME: AUTOCAD

PAT - Vector-Pattern PROGRAM NAME: COREL DRAW

PBI - Profiler Binary Input PROGRAM NAME: MS SOURCE PROFILER

PBK - Phonebook

PBM - Portable Bit Map Graphic

PBO - Profiler Binary Output PROGRAM NAME: MS SOURCE PROFILER

PBT - Profiler Binary Table PROGRAM NAME: MS SOURCE PROFILER

PC - Text file - IBM PC specific

PC3 - Custom palette PROGRAM NAME: HARVARD GRAPHICS 3.0

PC8 - ASCII Text IBM-8

PCD - Photo-CD Image

PCF - Profiler Command File PROGRAM NAME: MS SOURCE PROFILER

PCH - Patch File

PCH - PreCompiled Header PROGRAM NAME: MS C/C++

PCK - pick file PROGRAM NAME: TURBO PASCAL

PCL - Printer Control Language data file PROGRAM NAME: HP LaserJet Printer

PCM - LaserJet cartridge information PROGRAM NAME: HP LaserJet Printer

PCS - Animation PROGRAM NAME: PICS

PCT - Bitmap Graphic PROGRAM NAME: PC Paint

PCW - Text file PROGRAM NAME: PC WRITE

PCX - Bitmap Graphic Zsoft format PROGRAM NAME: PC Paintbrush, Paint, Zsoft

PDB - PROGRAM NAME: TACT

PDF - Portable Document Format PROGRAM NAME: Adobe Acrobat Reader

PDG - PROGRAM NAME: PrintShop Deluxe

PDI - PROGRAM NAME: MS POWERPOINT

PDR - Printer driver

PDR - Port driver

PDS - PDS Graphic

PDV - Printer driver PROGRAM NAME: PAINTBRUSH

PEB - Program Editor bottom overflow file PROGRAM NAME: WORDPERFECT

PED - Program Editor delete save PROGRAM NAME: WORDPERFECT

PEM - Program Editor macro PROGRAM NAME: WORDPERFECT

PEQ - Program Editor print queue file PROGRAM NAME: WORDPERFECT

PER - Program Editor resident area PROGRAM NAME: WORDPERFECT

PES - Program Editor work space file PROGRAM NAME: WORDPERFECT

PET - Program Editor top overflow file PROGRAM NAME: WORDPERFECT

PF - Profile - Monitors, Printers

PFA - Type 1 font - ASCII format

PFB - Type 1 font - Encrypted format

PFK - Programmable function keys PROGRAM NAME: XTREE PRO

PFM - Postscript Font Metric or Printer Font Metric - Type 1 font

PFT - Printer Font PROGRAM NAME: CHIWRITER

PGL - 7475A plotter PROGRAM NAME: Vector Graphics

PGM - Portable Gray Map graphic

PGP - PROGRAM NAME: PRETTY GOOD PRIVACY

PH - PERL Header

PH - Phrase-table PROGRAM NAME: MS C/C++, MS HELP COMPILER

PHTML - HTML document with PreProcessing Instructions - (PPIs)

PIC - PICT - Bitmap graphic format, or PIXAR picture file

PICT - PICT2 - QuickDraw vector format bitmapped images PROGRAM NAME: Macintosh QuickDraw

PIF - Program Information File PROGRAM NAME: MS WINDOWS

PIT - Compressed Archive File Macintosh PROGRAM NAME: PACKIT

PIX - Inset Systems graphic

PJT - Project memo PROGRAM NAME: Visual FoxPro

PJX - Project file PROGRAM NAME: Visual FoxPro

PKA - Compressed Archive File PROGRAM NAME: PKARC

pkg - AppleLink package compression format PROGRAM NAME: StuffIt Expander

PL - Palette PROGRAM NAME: HARVARD GRAPHICS FOR WINDOWS

PL - PERL Program File

PL3 - Chart Palette PROGRAM NAME: HARVARD GRAPHICS 3.0

PLB - Library PROGRAM NAME: FOXPRO

PLC - Add-In PROGRAM NAME: LOTUS 1-2-3

PLN - Spreadsheet file PROGRAM NAME: WORDPERFECT FOR WINDOWS

PLT - HPGL Plotter file Vector graphic PROGRAM NAME: AUTOCAD

PM - PageMaker Graphic

PM3 - Document PROGRAM NAME: PAGEMAKER 3

PM4 - Document PROGRAM NAME: PAGEMAKER 4

PM5 - Document PROGRAM NAME: PAGEMAKER 5

PN3 - Printer driver PROGRAM NAME: HARVARD GRAPHICS 3.0

PNG - Portable Network Graphics bitmap

PNG - Paint Shop Pro Browser file PROGRAM NAME: Paint Shop Pro

PNM - Portable aNy Map Graphic

PNT - Macintosh painting

POP - Popup Menu PROGRAM NAME: dBASE

POV - Persistence Of Vision raytracer

PP - Compressed Archive File Amiga PROGRAM NAME: POWERPACKER

PPA - PowerPoint Add-in PROGRAM NAME: Microsoft PowerPoint

PPD - PostScript Printer Description

PPL - PolaroidPalettePlus ColorKey Driver PROGRAM NAME: HARVARD GRAPHICS 3.0

PPM - Portable Pixel Map graphic

PPO - Preprocessor output PROGRAM NAME: CLIPPER 5

PPS - PowerPoint Slideshow PROGRAM NAME: Microsoft PowerPoint

PPT - PowerPoint presentation PROGRAM NAME: Microsoft PowerPoint

PR2 - Printer driver PROGRAM NAME: DBASE IV

PR2 - Presentation PROGRAM NAME: ALDUS PERSUASION 2.0

PR3 - PostScript Printer driver PROGRAM NAME: DBASE IV

PRD - Printer driver PROGRAM NAME: Microsoft Word, Word Perfect, Works

PRE - Preference Settings PROGRAM NAME: MS C/C++

PRF - Printer driver PROGRAM NAME: DBASE IV

PRF - Profiler output

PRG - Program file PROGRAM NAME: CLIPPER 5 / dBASE IV / dBFAST / FOXPRO

PRJ - Project file

PRM - Parameter PROGRAM NAME: Diverse

PRN - Text file PROGRAM NAME: LOTUS 1-2-3 / SYMPHONY

PRN - Temporary Print file

PRN - Printer driver PROGRAM NAME: XyWrite

PRO - PROLOG Program File

PRS - Printer ReSource file for fonts PROGRAM NAME: WordPerfect

PRS - procedure PROGRAM NAME: DBASE IV

PRS -PROGRAM NAME: HARVARD GRAPHICS

PRT - Printer Configuration PROGRAM NAME: IRMA WORKSTATION FOR WINDOWS

PRT - Printer driver PROGRAM NAME: DR. HALO

PRX - Compiler Program PROGRAM NAME: FOXPRO

PS - PostScript - ASCII format

PSF - PostScript Printer Font PROGRAM NAME: CHIWRITER

PSM - Symbol table PROGRAM NAME: TURBO PASCAL

PT3 - Device driver PROGRAM NAME: HARVARD GRAPHICS 3.0

PT3 - Template PROGRAM NAME: PAGEMAKER 3

PT4 - Template PROGRAM NAME: PAGEMAKER 4

PT5 - Template PROGRAM NAME: PAGEMAKER 5

PUB - Public Key Ring PROGRAM NAME: PRETTY GOOD PRIVACY

PUB - Publication PROGRAM NAME: Ventura Publisher, Microsoft Publisher

PW - Text file PROGRAM NAME: PROFESSIONAL WRITE

PWD - Pocket Word Document PROGRAM NAME: Microsoft

PWL - Password List

PWZ - Wizard PROGRAM NAME: Microsoft PowerPoint

PX - Primer Database index PROGRAM NAME: PARADOX

PXL - Pocket PROGRAM NAME: Microsoft Excel

PY - PYTHON script

PYC - Compiler PYTHON Script

PZD - PROGRAM NAME: PIZAZZ PLUS

PZO - PROGRAM NAME: PIZAZZ PLUS

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- Q -

QAG - Quick Access Group PROGRAM NAME: NORTON DESKTOP

QBD - Keyboard layout PROGRAM NAME: IRMA WORKSTATION FOR WINDOWS

QBE - Query By Example PROGRAM NAME: dBASE IV / QUATTRO PRO

QBO - Ordered Query PROGRAM NAME: DBASE IV

QBW - PROGRAM NAME: QuickBooks for Windows

QDK - Memmory Manager PROGRAM NAME: Quarterdeck Qemm

QEF - Query PROGRAM NAME: Q+E For MS EXCEL

QEP - PROGRAM NAME: IRMA WORKSTATION FOR WINDOWS

QLB - Quick Library PROGRAM NAME: MS C/C++

QLC - ATM font information

QLC - PostScript Help file

QPR - Relational Query PROGRAM NAME: FOXPRO

QPR - driver for Printer queue PROGRAM NAME: OS/2

QPX - Ordered Query PROGRAM NAME: FOXPRO

QRS - Equation Editor PROGRAM NAME: WORDPERFECT FOR WINDOWS

QRT - QRT ray tracing Graphic

QRY - Query PROGRAM NAME: DBASE IV, Microsoft

qt - Movie, binary file type PROGRAM NAME: QuickTime

QTM - Movie PROGRAM NAME: QuickTime

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