The top file extensions Windows site

file extension Windows/OS2/Apple/Unix/Dos

File ExtensionsWindows/OS2/Apple/UNIX

Select Extension by starting letter:

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 -
OTHER - Allowedchars in file names - what is an extension?
Links Converter
graphical file formats - Potentially harmful extensions contributors

internals

Bookmark this site

Search: Use ctrl-F to search foritem

Universal dump utility for non-destructive dump/list/string search etc dump.zip

N = cygwin man file

N64 = Nintento 64® Emulation ROM Image

NA2 = Netscape Communicator addressbook

NAA = MSNBC News alert advertising data

NAB = Netscape Communicator addressbook

NAC = MSNBC News alert channel data

NaCl = (MAC FILE_TYPE) NameCleaner

NAD = Noder File (Polish)

NAH = Xsysfile

NAI = Xsysfile

NAK = Audio file

NAL = NimbleGen Array Layout for ArrayScribe(TM) - http://www.nimblegen.com/products/software/arrayscribe/

NAM = Sheffield dictionary file

NAN = Nanoscope File

NAP = Mime: image/naplps

NAP = NAPLPS Vector image metafile (VideoShow/EnerGraphics)

NAPLPS = Mime: image/naplps

NAPLPS = North American Presentation Layer Protocol Syntax = Vector image

NaPr = (MAC FILE_TYPE) NameCleaner Prefs File

NAS = Xsys file

NAV = AirNav image format

NAV = Ms Network component

NAV = MSN Application Extension

NAVIONICS = GPS chart format

NB = Mime: application/mathematica

NB = Nota Bene text document

NB = Notebook (Corel WordPerfect tbv)

NBA = Nba game data

NBI = NBBACKUPType open with: "%ProgramFiles%\Ahead\Nero BackItUp\backitup.exe" "%1"

NBI = NewsbinPro.Document open with: %Applications%\newsbin\nbpro.exe "%1"

NBI = NewsbinPro.Document open with: %Root%\Tools\NewsBin5\nbpro.exe "%1"

NBR = Number

NBT = NeroBackItUp.Files7.nbt open with: "%ProgramFiles%\Nero\Nero 7\Nero BackItUp\BackItUp.exe" "%1"

NC = Instructions for Numerical Control machine (CAMS)

NC = Mime: application/x-netcdf

NC = Preprosessed GOC source : non-error-checking (GEOS)

NC = Unidata netCDF Graphics

NC? = FLASHGET downloader incomplete download

NC_ = NeroBackItUp.Files7.nc_ open with: "%ProgramFiles%\Nero\Nero 7\Nero BackItUp\BackItUp.exe" "%1"

NCB = Class browsing information (Ms Developer Studio)

NCC = CNC (Computer Numeric Control) control file (CamView 3D)

Ncch = (MAC FILE_TYPE) Microsoft Internet Cache

NCD = CoverDesigner image format

NCD = Norton Change Directory (disk directory information)

NCF = NetWare configuration = STARTUP.NCF

NCH = MS Outlook Express Email Tree

NCLK = Mime: text/html

NCM = Mime: application/vnd.nokia.configuration-message

NCM = Nokia Communicator configuration message

NCO = NBCOMPRESSType open with: "%ProgramFiles%\Ahead\Nero BackItUp\nbr.exe" "%1"

NCO = NeroBackItUp.Files7.nco open with: "%ProgramFiles%\Nero\Nero 7\Nero BackItUp\BackItUp.exe" "%1"

NCP = Nhl Ice Hockey 2002 user nhlcards file

NCR = NCR Image image format

NCS = Netscape Conference Call file

NCSA = (MAC FILE_TYPE) NCSA Telnet

NCSA = Bitmap image (Hierarchical Data File) (NCSA)

NCT = CoverDesigner Template image format

NCW = NeroCoverDesigner.Files7.ncw open with: "%ProgramFiles%\Nero\Nero 7\Nero CoverDesigner\CoverDes.exe" "%1"

NDA = NeroBackItUp.Files7.nda open with: "%ProgramFiles%\Nero\Nero 7\Nero BackItUp\BackItUp.exe" "%1"

NDB = Mime: x-lml/x-ndb

NDB = Network database (Intellicom/Compex)

NDE = EnDe_Encrypt_Decrypt open with: "%root%\ende_binary\EnDe.exe"-path:"%1"

NDF = NimbleGen Design File

NDL = Inmos hardware network description file

NDL = Lotus Notes data

NDL = Mime: application/vnd.lotus-notes

NDL = Nodelist file

NDO = 3D Low-polygon Modeler

ndrv = (MAC FILE_TYPE) System Driver

NDSIS = Injury Surveillance Data Exchange specification

NDX = dBase Index (generally database index)

NED = MSN Application Extension

NEF = Nikon Electronic Image Format

NEG = NtRegEdit.File special configuration file for application(binary format)

NEO = Atari NeoChrome bitmap image

NERO_SCOUT_VIDEO = NeroScoutVideo special configuration file for application(binary format)

NES = Nintendo Entertainment System ROM Image

NET = gen. Network configuration/info file

NETCDF = Scientific data NETwork Common Data Format

NEU = gen. german new

NEW = New info

NEWS = (MAC FILE_TYPE) Newsgroup f

NEWS = NeWS bitmap image

NEZ = Emulator file used for game consoles (NES)

NF = Cvip nf_help file

NFD_AUDIO = NFDAudio special configuration file for application(binary format)

NFD_DATA = NFDData special configuration file for application(binary format)

NFF = Haines Neutral File Format and WorldToolkit minimal 3D scene description language

NFG = Newsbin config file

NFO = MsInfo document

NFO = Netware Folio help format

NFT = Netobjects fusion Netobjects System file

NFX = Netobjects fusion Components Bbscomp file

NG = Norton guide online documentation database

NGB = Nonogram puzzle

NGD = NimbleGen Gene Description

NGDBN = .wmpt VMAYSVTAGElUwBhJVMAYSQ==

NGG = Nokia Group Graphics image format

NGL = Sheffield dictionary file

NGO = NG linker object ( = NGML)

NGP = NimbleGen Project

NGS = NG compiler source ( = NGC)

NHF = Nero HFS-CD Compilation

NHL = Nhl Ice Hockey game 2002 user teams file

NI = Netobjects fusion Preview file

NIB = Corel Graphics10 Photopoint file

NICK = NICKFile special configuration file for application(binary format)

NIF = Binary hardware network initialisation file

NIF = Mime: application/x-nif

NIF = Mime: image/x-niff

NIF = NIFF Navy Image File Format (bitmap) graphics interchange format

NIFF = Bitmap image (Navy Interchange File Format)

NIFF = Mime: image/x-niff

NIL = Norton Icon Library file

NimbleGen ArrayScribe = NimbleGen Array Layout Editor

NISI = (MAC CREATOR CODE) Nisus NISI text

NIST = Audio (short ints,mono,NIST header:1024 byte, used in TIMIT)

NITF = National Imagery Transmission Format

NIX = Mime: application/x-mix-transfer

NIX = REF file

NJI = NBJOBType open with: "%ProgramFiles%\Ahead\Nero BackItUp\nbj.exe" "%1"

NJI = NeroBackItUp.Files7.nji open with: "%ProgramFiles%\Nero\Nero 7\Nero BackItUp\BackItUp.exe" "%1"

NJT = NeroBackItUp.Files7.njt open with: "%ProgramFiles%\Nero\Nero 7\Nero BackItUp\BackItUp.exe" "%1"

NJX = NJStar Document

NK2 = NICKFile special configuration file for application(binary format)

NL = Norton Desktop Icon Library

NL_ = WIN32S compressed file

NLB = Game: colin Mc Rae car race Network Leader boards file

NLD = WINXP SYSTEM32 file

NLM = Nokia animations screen

NLM = Nokia Logo File image format

NLM = Novell Netware Loadable Module

NLP = Newsletter Profi 2001

NLS = Character Translation; National Language Services driver (font or font map)

NLS = Mime: text/nls

NLU = Norton Live Update E-Mail Trigger file

NLX = FormWorx form

NMD = NeroBurningROM.Files7.nmd open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NMD = NeroBurningROM.Files8.nmd open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NMEA = GPS protocol(0183) send and receive waypoints + other data

NMGF = 2d Graphic

NMK = Oc2.316s cakit file

NML = Mime: application/vnd.enliven

NML = News Markup Language

NMP = Neopaint Mask image format

NMS = Numega Softice's Loader File (includes debugging info)

NMW = T126_Whiteboard, open with: NetMeeting wb32.exe

NMZ = Mime: application/x-scream

NND = Mime: application/vnd.noblenet-directory

NNS = Mime: application/vnd.noblenet-sealer

NNTP = (MAC FILE_TYPE) NewsWatcher

NNW = Mime: application/vnd.noblenet-web

NOA = movie file from japanese cell phone

NOD = Netobjects fusion nodes file

NOI = Tgif-3.0 file

NOISERUN = NoiseRunner format

NOL = Nokia Operator Logo image format

NON = NONogram puzzle

NOT = NOTation or NOTe

NOTE = WordPerfect for Mac help document

NOTEWORTHY = Noteworthy 2 File Format

notz = (MAC FILE_TYPE) Stickies

NOVs = (MAC FILE_TYPE) NetWare Control Center

NOW = UN-HTML15 file

NP = Project schedule (Nokia Planner) (Visual Planner 3.x)

NP? = Sound

NPD = Noder File (Polish)

npdt = (MAC FILE_TYPE) Note Pad File

npdt = (MAC FILE_TYPE) NotePad

NPF = NTI Backup

NPI = Source for DGEN.EXE interpreter (dBASE Application Generator)

NPM = Corel Graphics10 Draw media lines file

NPS = Lotus Agenda File

NPX = Mime: application/x-netfpx

Nqst = (MAC CREATOR CODE) SoundEdit 16 v.2

NR3 = NeroBurningROM.Files7.nr3 open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NR3 = NeroBurningROM.Files8.nr3 open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NR4 = NeroBurningROM.Files7.nr4 open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NR4 = NeroBurningROM.Files8.nr4 open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NRA = Nero Audio-CD Compilation

NRB = Nero CD-ROM Boot Compilation

NRC = NeroBurningROM.Files7.nrc open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NRC = NeroBurningROM.Files8.nrc open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NRD = NeroBurningROM.Files7.nrd open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NRD = NeroBurningROM.Files8.nrd open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NRF = Bitmap image (Neutral Raster File)

NRG = Nero -Burning Rom (CD-burn image)

NRH = Nero Hybrid CD-ROM Compilation

NRI = Nero - Burning Rom (CD-burner software) file

NRJ = NeroBurningROM.Files8.nrj open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NRJ = NeroExpress.Files7.nrj open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NRM = Nero Mixed-Mode-CD Compilation

NRS = NeroBurningROM.Files7.nrs open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NRS = NeroBurningROM.Files8.nrs open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NRT = Nokia RingTone

NRU = Nero UDF/ISO CD-ROM Compilation

NRV = Nero Video-CD Compilation

NRW = NeroBurningROM.Files7.nrw open with: "%ProgramFiles%\Nero\Nero 7\Core\nero.exe" "%1"

NRW = NeroBurningROM.Files8.nrw open with: "%ProgramFiles%\Nero\Nero Core\nero.exe" "%1"

NS2 = Lotus Notes data

NS2 = Mime: application/vnd.lotus-notes

NS3 = Lotus Notes data

NS3 = Mime: application/vnd.lotus-notes

NS4 = Lotus Notes Database

NS4 = Mime: application/vnd.lotus-notes

NSA = Winamp.File open with: "%ProgramFiles%\Winamp\winamp.exe" "%1"

NSA = Winamp.File open with: %ProgramFiles%\VIDEOLAN\VLC\vlc.exe %1

NSB_SEARCH_MORE = NSBSearch special configuration file for application(binary format)

NSC = Noder File (Polish)

NSC = Mime: application/x-conference

NSD = Norton System Doctor Configuration

NSF = Lotus Notes data

NSF = Mime: application/vnd.lotus-notes

NSG = Lotus Notes data

NSG = Mime: application/vnd.lotus-notes

NSH = Lotus Notes data

NSH = Mime: application/vnd.lotus-notes

NSI = Symantec Shared file

NSL = Nokia Logo File

NSO = NetStudio Easy Web Graphics File

NSPL = (MAC FILE_TYPE) Netscape Plug-i

NSS = Norton ScreenSaver module (NC - NDW Screen Saver)

NST = Lotus Notes Template

NST = NoiseTracker music module, originaly Amiga

NSV = Winamp.File open with: "%ProgramFiles%\Winamp\winamp.exe" "%1"

NSV = Winamp.File open with: %ProgramFiles%\VIDEOLAN\VLC\vlc.exe %1

NSX = Compound index file of uccessWare SIX 3.00

NT = Windows NT startup files

NT0 = Adressmn file

NT1 = Adressmn file

NT2 = Adressmn file

NT3 = Adressmn file

NT_ = VFW compressed file

NTF = Lotus Notes database template

NTF = Mime: application/vnd.lotus-notes

NTH = Imagemagick-5.3.2 Visualmagick jbig file

NTP = Mediaface Design Software Image Library v1.2

NTR = NetRun executable ascii text file

NTS = NetSend executable ascii text file

NTS = Norton tutorial

NTX = Clipper database index

NTZ = InVircible antivirus blueprint

NU4 = Norton Utilities Dll root file

NU6 = Norton utility system Dll file

NUF = Procomm Plus Message for new users on their 1st call

NUL = Ccs-lib.2 Acs file

NULL = NULL image

NUM = Dos7 file

NURBS = 3d Graphic /spatial data

NUT = Lucas Arts Animation

NVC = NeroVision.Document open with: "%ProgramFiles%\Ahead\NeroVision\NeroVision.exe" "%1"

NVC = NeroVision.Document open with: "%ProgramFiles%\Nero\Nero 7\Nero Vision\NeroVision.exe" "%1"

NVD = Aolpress Help file

NVD = Mime: application/x-navidoc

NVM = Aolpress Help file

NVM = Mime: application/x-navimap

NVR = PerceivedType text

NW3 = Netware.3x file

NW4 = Netware.4x file

NW_ = Midiprg Noteworthy compressed file

NWC = Noteworthy Composer Song File

NWS = Internet News Message text or HTM

NWS = Mime: message/rfc822

NWUt = (MAC FILE_TYPE) NetWare Tools

nX^2 = (MAC CREATOR CODE) WriteNow 3

nX^2 = (MAC FILE TYPE) Write Now 3 file

nX^2 = (MAC FILE_TYPE) WriteNow 3

nX^d = (MAC FILE TYPE) Write Now 2 file

nX^d = (MAC FILE_TYPE) WriteNow Document

nX^n = (MAC CREATOR CODE) Write Now v. 3

nX^n = (MAC CREATOR CODE) WriteNow 2

nX^n = (MAC FILE TYPE) WriteNow 2

nX^n = (MAC FILE TYPE) WriteNow 3

nX__ = (MAC FILE_TYPE) WriteNow 4 Document

NXT = Next Font

NXT = Sound (NeXT format)

NYM = Sheffield dictionary file

NZ = Audio Utility Tuningwrench compressed file

NZB = BinTube.nzb special configuration file for application(binary format) BinTube.backup NewsBin.NZB

nzht = (MAC FILE_TYPE) Hotline Client Data

Search: Use ctrl-F to search for item

Universal dump-utility for non-destructive dump/list/search string etc dump.zip

Select Extension by starting letter:

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 - OTHER - Allowed chars in Filenames - what is an extension?

If you find an extension missing, write! No guarantee given for completeness or correctness. If you feel an extension is outdated, write!
Authors and retailers: it is in the interest of us all and our customers to avoid the double use of extensions! Please help us keep this compilation up todate!
Send extension data to: update@file-ext.4uj.org
Any questions for not listed extensions or "what program opens xxx": search@file-ext.4uj.org
Any other questions, remarks, praise, flaming or reproach: info@file-ext.4uj.org
Compilation Copyright (c) 2002 R.Bitsch, Compilation Copyright (c) 2009,2010 R.Cooper-Bitsch