File Format Extensions

 

This is a simple list of file name extensions or suffixes

that indicate the format or usage of a file and a brief description of that format.

 

 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

Numbers & Symbols  

 

 A

ABK

Corel Draw AutoBackup

ACL

Corel Draw 6 keyboard accelerator

ACL

Microsoft Office Auto Correction List

ACM

Audio Compression Manager driver. Used by Windows in the system directory

ACP

Microsoft Office Assistant Preview file

ACT

Documenting Wizard action diagram (used by Microsoft Visual FoxPro 6)

ACT

Microsoft Office Assistant Actor file

ACV

OS/2 drivers that compress and decompress audio data

AD

After Dark screensaver

ADB

Appointment database used by HP 100LX organizer

ADD

OS/2 adapter drivers used in the boot process

ADF

Administration configuration files

ADM

After Dark MultiModule screensaver

ADP

Used by FaxWorks to do setup for fax modem interaction

ADR

After Dark Randomizer screensaver

AEP

Adobe After Effects project file

AF2

ABC Flowchart file

AF3

ABC Flowchart file

AFM

Adobe font metrics

AI

Adobe Illustrator drawing

AIF

Mac OS AIFF sound

AIFC

Similar to AIF

AIFF

Similar to AIF

AIS

ACDSee Image Sequence file

ALB

JASC Image Commander album

ALC

DataAlchemy project files

ALL

Arts & Letters Library

AMS

Velvert Studio music module (MOD) file

ANC

Canon Computer Pattern Maker file that is a selectable list of pattern colors

ANI

Animated mouse cursor

ANN

Annotation to a Windows Help (.HLP) file

ANS

ANSI text

API

Application Program Interface file; used by Adobe Acrobat

APP

Generated application or Active Document (used by Microsoft Visual FoxPro 6)

APR

Lotus Approach 97 file

APS

Microsoft Visual C++ file

ARC

LH ARC (old version) compressed archive

ARI

Aristotle audio file

ARJ

Robert Jung ARJ compressed archive

ART

Xara Studio drawing

ART

Canon Crayola art file

ASA

Microsoft Visual InterDev file

ASC

ASCII text

ASC

Indian Languages Document (iLeap)

ASC

Used by PGP (see http://www.pgpi.org)

ASD

WinWord AutoSave

ASF

Microsoft Advanced Streaming Format file

ASM

Assembler language source file

ASP

Active Server Page (an HTML file containing a Microsoft server-processed script)

ASP

Procomm Plus setup and connection script

AST

Claris Works "assistant" file

ASX

Cheyenne Backup script

ASX

Microsoft Advanced Streaming Redirector file

ATT

AT&T Group 4 bitmap

AU

UNIX sound file

AUX

Sort of a write-out file for the LaTeX program

AVI

Microsoft Video for Windows video clip

AWD

FaxView document

AWS

Fax signature viewer

 

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B4

Helix Nuts and Bolts file

BAK

Backup file

BAS

BASIC code

BAT

MS-DOS batch file

BFC

Windows 95 Briefcase document

BG

Backgammon for Windows game

BI

Binary data file

BIF

GroupWise initialization file

BIN

Binary data file

BK

Sometimes used to denote backup versions

BK$

Sometimes used to denote backup versions

BKS

An IBM BookManager Read bookshelf

BMK

An A bookmark file

BMP

Picture (Windows or OS/2 bitmap)

BM1

Apogee BioMenace data file

BRX

A file for browsing an index of multimedia options (pictures, sound, text, videos) on a CD-ROM

BS1

Apogee Blake Stone data file

BSP

Quake map

BS_

Microsoft Bookshelf Find Menu shell extension

BTM

Batch file used by Norton Utilities

BUN

CakeWalk Audio Bundle file (a MIDI program)

 

 

 

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C

C code

CAB

Microsoft cabinet file (program files compressed for software distribution)

CAL

CALS Compressed Bitmap

CAL

Calendar schedule data

CAS

Comma-delimited ASCII file

CAT

IntelliCharge categorization file used by Quicken

CB

Microsoft clean boot file

CCB

Visual Basic Animated Button configuration

CCF

Multimedia Viewer configuration file used in OS/2

CCH

Corel Chart

CCM

Lotus CC:Mail "box" (for example, INBOX.CCM)

CCO

CyberChat data file

CCT

Macromedia Director Shockwave cast

CDA

CD Audio Track

CDF

Microsoft Channel Definition Format file

CDI

Philips Compact Disk Interactive format

CDR

Corel Draw drawing

CDT

Corel Draw template

CDX

Compound index (used by Microsoft Visual FoxPro 6)

CDX

Corel Draw compressed drawing

CEF

Compact Embedded Font

CEL

CIMFast Event Language file

CER

Certificate file (MIME x-x509-ca-cert)

CFB

Comptons Multimedia file

CFG

Configuration file

CGI

Common Gateway Interface script file

CGM

Computer Graphics Metafile

CH

OS/2 configuration file

CHK

File fragments saved by Windows Disk Defragmenter or ScanDisk

CHM

Compiled HTML file

CHP

Ventura Publisher chapter

CHT

ChartViewer file

CHT

Harvard Graphics vector file

CIL

Clip Gallery download package

CIM

Sim City 200 file

CIN

OS/2 change control file that tracks changes to an INI file

CK1

iD/Apogee Commander Keen 1 data file

CK2

iD/Apogee Commander Keen 2 data file

CK3

iD/Apogee Commander Keen 3 data file

CK4

iD/Apogee Commander Keen 4 data file

CK5

iD/Apogee Commander Keen 5 data file

CK6

iD/Apogee Commander Keen 6 data file

CLASS

Java class

CLP

Windows Clipboard file

CLS

Visual Basic Class Module

CMD

Command file for Windows NT (similar to a DOS .BAT file)

CMD

DOS CP/M command file

CMD

dBase-II program file

CMF

Corel Metafile

CMP

JPEG Bitmap

CMP

Address document

CMV

Corel Move animation

CMX

Corel Presentation Exchange image

CNF

Configuration file used by Telnet, Windows, and other applications with varying internal formats

CNM

Windows application menu options and setup file

CNQ

Compuworks Design Shop file

CNT

Windows (or other) system content files for the help index and other purposes

COB

trueSpace2 object

COD

Microsoft C compiler output as displayable machine language/assembler with original C as comments

COM

Command file (MS-DOS based program)

CPD

Fax cover page

CPE

Fax Cover document

CPI

MS-DOS code page information file

CPL

Control Panel application

CPL

Corel colour palette

CPP

C++ code

CPR

Corel Presents Presentation

CPT

Corel Photo-Paint image

CPX

Corel Presentation Exchange Compressed drawing

CRD

Windows Cardfile document

CRP

Corel Presents Run-Time Presentation

CRT

Certificate file

CRT

Commodore 64 Cartridge Image (see http://www.nims.nl/C64/)

CSC

Corel Script

CSP

PC Emcee On-Screen image

CSS

Cascading Style Sheet file

CST

Macromedia Director "Cast" (resource) file

CSV

Comma-separated data file

CT

Scitex CT Bitmap

CT

A graphic file associated with the Paint Shop Pro Graphic Editor

CTL

Used in general to mean a file containing control information. FAXWorks uses it to keep information about each fax sent and received.

CUE

Microsoft Cue Cards data

CUR

Windows cursor (pointer)

CUT

Dr Halo bitmap

CV

Corel Versions archive

CV

Microsoft CodeView information screen

CWK

Claris Works data file

CWS

Claris Works template

CXT

Macromedia Director protected (not editable) "Cast" (resource) file

CXX

C++ source code file

 

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D64

Commodore 64 disk image (see http://www.nims.nl/C64/)

DAT

System data file

DAT

WordPerfect Merge Data

DB

Borland's Paradox (DOS) Data Base table

DBC

Database (used by Microsoft Visual FoxPro 6)

DBF

Aston-Tate dBASE database

DBF

Table (used by Microsoft Visual FoxPro 6)

DBG

Debugger configuration (used by Microsoft Visual FoxPro 6)

DBX

DataBeam image

DCR

Shockwave file

DCS

Desktop Color Separation file

DCT

Database memo (used by Microsoft Visual FoxPro 6)

DCX

Database index (used by Microsoft Visual FoxPro 6)

DCX

Fax image (based on PCX)

DDF

BTRIEVE database

DEF

SmartWare II data file

DEF

C++ Definition

DEP

Dependency file (created by the Setup Wizard, used by Microsoft Visual FoxPro 6)

DER

Certificate file

DHTML

Dynamic Hypertext Mark-up Language document

DIB

Device-Independent Bitmap

DIC

Dictionary

DIF

Data Interchange Format spreadsheet

DIR

Macromedia Director file

DIZ

Description file

DLG

C++ Dialogue Script

DLL

Windows Dynamic Link Library

DMF

X-Trakker music module (MOD) file

DOC

FrameMaker or FrameBuilder document

DOC

Microsoft Word document

DOC

WordPad document

DOC

WordPerfect document

DOC

WordStar document

DOS

MS-DOS based file (also extension for NDIS2 net card and protocol drivers)

DOT

Microsoft Word document Template

DPR

Borland Delphi project header file

DRV

Device driver

DRW

Micrografx Designer/Draw

DSG

DooM saved game

DSM

Dynamic Studio music module (MOD) file

DSP

Microsoft Developer Studio project

DSQ

Corel QUERY file

DSW

Microsoft Developer Studio workspace

DTF

Symantec Q&A relational database data file

DUN

Microsoft Dial-up Networking Export file

DV

Digital video file (MIME)

DVI

Used to visualize TeX/LaTeX files with Xdvi

DWD

DiamondWare digitized file

DWG

AutoCAD drawing, or older Generic CADD drawing format

DXF

Drawing Interchange (eXchange) format,a text representation of the binary DWG format

DXR

Macromedia Director protected (not editable) movie file

 

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EMF

Enhanced Windows Metafile

EML

Microsoft Outlook Express mail message (MIME RFC 822)

ENC

Encore file

ENF

EndNote Filter

ENL

EndNote Library

ENS

EndNote Style

ENZ

EndNote Connection File

EPS

Encapsulated PostScript image

ER1

ERWin file

ERR

Compilation error (used by Microsoft Visual FoxPro 6)

ERX

ERWin file

ESL

Visual FoxPro support library (used by Microsoft Visual FoxPro 6)

EVY

Envoy document

EWL

Microsoft Encarta document

EXC

Microsoft Word Exclusion Dictionary

EXE

Executable file (program, application)

 

F 

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F

FORTRAN file

F77

FORTRAN file

F90

FORTRAN file

FAR

Farandole Composer music module (MOD) file

FAV

Microsoft Outlook navigation bar

FAX

FAX Type image

FCL

Cyber Audio Library link file

FDF

Adobe Acrobat Forms Document file

FFF

Folio Flat files

FH3

Aldus FreeHand 3 drawing

FH4

Aldus FreeHand 4 drawing

FH5

Macromedia FreeHand 5 drawing

FH7

Macromedia FreeHand 7 drawing

FH8

Macromedia FreeHand 8 drawing

FIF

Fractal image file

FITS

CCD camera image

FKY

Macro (used by Microsoft Visual FoxPro 6)

FLC

AutoDesk FLIC animation

FLI

AutoDesk FLIC animation

FLL

Visual FoxPro Dynamic Link Library

FLT

Corel filter

FLT

StarTrekker music module (MOD) file

FMB

Oracle binary source code for form, version 4.0 and later

FML

File Mirror List (GetRight)

FMT

Format file (used by Microsoft Visual FoxPro 6)

FMT

Oracle text format of form, version 4.0 and later

FMT

Microsoft Schedule+ print file

FMX

Oracle executable form, version 4.0 and later

FND

Microsoft Explorer Saved Search file (Find applet)

FNG

Font group file (Font Navigator)

FOG

Fontographer font

FON

System font file

FOR

FORTRAN file

FOT

Font-related file (shortcut to font)

FP

FileMaker Pro file

FP1

Flying Pigs for Windows data file

FP3

FileMaker Pro file

FPT

Table memo (used by Microsoft Visual FoxPro 6)

FPX

FlashPix bitmap

FRF

FontMonger Font File which is then exported as TTF

FRM

Form

FRM

FrameMaker or FrameBuilder document

FRM

Oracle executable form version 3.0 and earlier

FRM

Visual Basic form

FRM

WordPerfect Merge form

FRT

Report memo (used by Microsoft Visual FoxPro 6)

FRX

Report (used by Microsoft Visual FoxPro 6)

FRX

Visual Basic form stash file

FTS

Full-Text Search index file resulting from using Find in the Windows help system

Can be erased; will be rebuilt when needed

FW3

Framework III file

FW4

Framework IV file

FXP

Compiled program (used by Microsoft Visual FoxPro 6)

 

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GAL

Corel Multimedia Manager album

GCD

Generic (TM) CADD drawing (later versions)

GCP

Ground Control Point file used in image processing of remote sensing data often to form map projections. CHIPS (CopenHagen Image Processing System) uses these files.

GED

Graphic Environment Document (drawing)

GEL

Gel image, Produced by ImageQuant software (Essentially a TIFF file)

GEM

GEM metafile

GEN

Ventura-Generated text file

GetRight

GetRight Unfinished-Download file

GFC

Patton&Patton Flowcharting 4 flowchart file

GFI

Genigraphics Graphics Link presentation

GFX

Genigraphics Graphics Link presentation

GHO

Norton Ghost drive or partition image file

GID

Windows 95 global index file (containing help status)

GIF

CompuServe bitmap

GIM

Genigraphics Graphics Link presentation

GIX

Genigraphics Graphics Link presentation

GKS

Gravis GripKey document

GLP

Glippo 2000 file (see http://www.nims.nl/g2000/)

GNA

Genigraphics Graphics Link presentation

GNX

Genigraphics Graphics Link presentation

GR3

Windows version 3.0 screen grabber

GRA

Microsoft Graph

GRD

Grid file, used in image processing of remote sensing data often to form map projections. CHIPS (CopenHagen Image Processing System) uses these files

GRP

Program Manager Group file

GT2

Graoumftracker (new) music module (MOD) file

GTK

Graoumftracker (old) music module (MOD) file

GWX

Genigraphics Graphics Link presentation

GWZ

Genigraphics Graphics Link presentation

GZ

UNIX Gzip compressed file

 

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H

C program header

HED

HighEdit document

HEL

Microsoft Hellbender saved game

HEX

Mac OS BinHex 2.0 file

HGL

HP Graphics Language drawing

HLP

Windows Help file

HOG

Lucas Arts Dark Forces WAD file

HPJ

Visual Basic Help Project

HPP

C++ program header

HQX

Mac OS BinHex 4.0 file

HST

History file

HT

HyperTerminal file

HTM

Hypertext Mark-up Language document

HTML

Hypertext Mark-up Language document

HTT

Microsoft Hypertext Template

HTX

Extended HTML template

 

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ICA

Citrix file

ICB

Targa bitmap

ICL

Icon Library file (an industry standard)

ICM

Image Color Matching profile file

ICO

Windows Icon

IDD

MIDI instrument definition

IDF

MIDI instrument definition (Windows 95 required file)

IDQ

Internet Data Query file

IDX

Index, compact index (used by Microsoft Visual FoxPro 6)

IDX

Symantec Q&A relational database index file

IFF

Amiga ILBM

IGF

Inset Systems metafile

IIF

QuickBooks for Windows interchange file

ILBM

A bitmap (graphic image) file

IMA

WinImage file

IMG

GEM image

INC

Assembler language or Active Server include file

INF

(Setup) Information file

INI

Configuration settings (Initialization file)

INP

Oracle source code for form, version 3.0 and earlier

INS

InstallShield install script

INS

X-Internet sign-up file

IOF

Findit document

IQY

Microsoft Internet Inquiry file

ISO

Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard

ISP

X-Internet sign-up file

ISU

InstallShield uninstall script

IT

Impulse Tracker music module (MOD) file

ITS

Internet document set (possibly a Microsoft file)

IW

Idlewild screensaver

 

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JAR

Java ARchive file (a compressed file for applets and related files)

JAVA

Java source code

JBF

Paint Shop Pro image browser file

JFF

JPEG file

JIF

JPEG file

JFIF

JPEG file

JMP

SAS JMPDiscovery chart-to-statistics file

JN1

Epic MegaGames Jill of the Jungle data file

JPE

JPEG file

JPEG

JPEG compressed bitmap

JPG

JPEG bitmap

JS

JavaScript source code

JTF

JPEG bitmap

 

K

KBD

Keyboard layout

KDC

Kodak Photo-Enhancer

KFX

Kofax Group 4 image

KYE

Kye game data

 

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LBM

Deluxe Paint bitmap

LBT

Label memo (used by Microsoft Visual FoxPro 6)

LBX

Label (used by Microsoft Visual FoxPro 6)

LDB

Microsoft Access lock file

LEG

Legacy document

LES

Logitech Entertainment system game profiles (same as REG file)

LGO

Windows logo driver

LHA

Alternate file suffix for LZH

LIB

Static-link library

LIS

Output file produced by a Structured Query Reporting (SQR) program

LNK

Windows shortcut file

LOG

Log file

LP1

GIST - CDAC's iLeap Multilingual (Indian) Document Version 1 (see http://www.cdac.org.in)

LP2

GIST - CDAC's iLeap Multilingual (Indian) Document Version 2 (see http://www.cdac.org.in)

LPD

Helix Nuts and Bolts file

LRC

Intel Video Phone file

LST

Documenting Wizard list (used by Microsoft Visual FoxPro 6)

LST

List file

LWO

Lightwave Object file

LWP

Lotus Wordpro 96/97 file

LZH

LH ARC compressed archive

LZS

Skyroads data file

 

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M

Either MATLAB functions or Mathematica (version>=3.0) packages

M1V

MPEG-related file (MIME type 'mpeg')

M3D

Corel Motion 3D animation

M3U

MPEG URL (MIME audio file)

MA

Old Mathematica (version<3.0) notebooks

MAC

MacPaint image

MAD

Microsoft Access module

MAF

Microsoft Access Form

MAK

Visual Basic or MS Visual C++ Project

MAM

Microsoft Access Macro

MAP

Map file

MAP

Duke Nukem 3D WAD game file

MAQ

Microsoft Access Query

MAR

Microsoft Access Report

MAS

Lotus Freelance Graphics Smartmaster file

MAT

Microsoft Access Table

MAX

Paperport file

MAZ

Hover maze data

MB1

Apogee Monster Bash data file

MCC

Dialer10 calling card

MCI

MCI command set

MCS

MathCAD image

MCW

Microsoft Word for Mac OS document

MDA

Microsoft Access add-in

MDB

File viewer extension

MDB

Microsoft Access database

MDE

Microsoft Access MDE file

MDL

Digital Tracker music module (MOD) file

MDL

Quake model file

MDN

Microsoft Access blank database template

MDW

Microsoft Access Workgroup

MDZ

Microsoft Access wizard template

MED

Music Editor, OctaMED music module (MOD) file

MEM

Variable save (used by Microsoft Visual FoxPro 6)

MER

Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others

MET

Presentation Manager metafile

MHTM

MHTML document (MIME)

MHTML

MHTML document (MIME)

MI

Miscellaneous

MIC

Microsoft Image Composer file

MID

MIDI music sequence

MIF

Adobe FrameMaker Maker Image Format

MIF

MIDI instrument file

MIX

Microsoft PhotoDraw 2000 picture format

MMF

Microsoft Mail message file

MMM

Microsoft Multimedia Movie

MNT

Menu memo (used by Microsoft Visual FoxPro 6)

MNX

Menu (used by Microsoft Visual FoxPro 6)

MOD

FastTracker, StarTrekker, Noise Tracker (etc.) music module file

MOD

Microsoft Multiplan spreadsheet

MOV

QuickTime for Windows movie

MP2

MPEG Audio Layer 2 file (MIME video file)

MP3

MPEG Audio Layer 3 file

MPA

MPEG-related file (MIME type 'mpeg')

MPD

Mini-port driver

MPE

MPEG animation

MPEG

MPEG animation

MPG

MPEG animation

MPP

Microsoft Project file

MPP

CAD drawing file format

MPR

Generated menu program (used by Microsoft Visual FoxPro 6)

MPX

Compiled menu program (used by Microsoft Visual FoxPro 6)

MSG

Microsoft Exchange mail document

MSN

Microsoft Network home base

MSP

Windows Paintbrush picture

MTM

MultiTracker music module (MOD) file

MUS

Music

MVB

Microsoft Multimedia Viewer file

MWP

Lotus Wordpro 97 Smartmaster file

 

N

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NAP

NAP Metafile

NB

Mathematica (version>=3.0) notebooks

NCB

Microsoft Developer Studio file

NFO

Folio Views

NIL

Norton Icon Library file (EasyIcons-compatible)

NLS

Natural language services driver

NLU

Norton Live Update E-Mail Trigger file

NS3

Lotus Notes 3 ODS (On Disk Structure)

NS4

Lotus Notes 4 ODS (On Disk Structure)

NSF

Lotus Notes database

NSH

Large file format for Notes 2

NST

Noise Tracker music module (MOD) file

NTF

Lotus Notes database template

NWS

Microsoft OutlookExpress news message (MIME RFC822)

 

O  

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OBD

Microsoft Office binder template

OBD

Microsoft Office Binder

OBJ

Object file

OBZ

Microsoft Office Binder Wizard

OCX

Microsoft Object Linking and Embedding custom control (ActiveX)

OFN

Microsoft Office FileNew file

OFT

Microsoft Outlook template

OKT

Oktalyzer music module (MOD) file

OLB

OLE Object Library

OLE

OLE object

OPT

Microsoft Developer Studio file

OR2

Lotus Organiser 2 file

OR3

Lotus Organiser 97 file

ORG

Lotus Organiser file

OSS

Microsoft Office Search file

OST

Microsoft Exchange Offline file

OTL

Super NoteTab template file (Fookes)

 

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P10

Tektronix Plot 10 drawing

P65

PageMaker 6.5 Publication

P7C

Digital ID file (MIME)

PAB

Microsoft Exchange personal address book

PAK

Quake WAD file

PAL

Windows colour palette

PAS

Pascal source code (Borland)

PAT

Corel Draw pattern

PCP

Symantec Live Update Pro file

PBK

Microsoft Phonebook

PBL

Prebill extension for CMS

PBM

Portable Bitmap

PCD

Kodak Photo-CD image

PCD

P-Code compiled test scripts as in Microsoft Tst and Microsoft Visual Test

PCL

HP Laserjet bitmap

PCS

PICS animation

PCT

Mac OS PICT drawing

PCX

ZSoft PC Paintbrush bitmap

PDB

Palm pilot database file

PDF

Adobe Acrobat Portable Document Format

PDF

Printer Definition File (Netware)

PDF

Package Definition File from Microsoft Systems Management Server

Verifies installed packages when performing an inventory scan of a client

PDR

Port driver

PDQ

Patton&Patton Flowcharting PDQ Lite file

PF

ICM profile

PFA

Type 1 font (ASCII)

PFB

Type 1 font (binary)

PFC

PF Component

PFM

Printer Font Metrics

PGL

HP Plotter drawing

PGM

Portable Graymap (bitmap)

PIC

PC Paint bitmap

PIC

Lotus picture

PIC

Mac OS PICT drawing

PICT

Mac OS PICT image file

PIF

IBM PIF drawing

PIF

(MS-DOS) Program Information File

PIG

Lucas Arts Dark Forces WAD file

PIN

Epic Pinball data file

PIN

Epic Pinball data file

PIX

Inset Systems bitmap

PJ

MKS Source Integrity file

PJT

Project memo (used by Microsoft Visual FoxPro 6)

PJX

Project (used by Microsoft Visual FoxPro 6)

PKG

Microsoft Developer Studio application extension (similar to a DLL file)

PL

Perl program

PLS

MPEG PLayList file (used by WinAmp)

PLT

HPGL Plotter drawing

PLT

AutoCAD Plot drawing

PM5

PageMaker 5.0 Publication

PM6

PageMaker 6.0 Publication

PNG

Portable Network Graphics bitmap

PNG

Paint Shop Pro Browser catalogue

PNT

MacPaint graphic file

PNTG