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Other Links and Notes

The file name extension is the three character designation appended to file names in windows systems. E.g. .doc for MS Word, .txt for plain text files, .gif .jpg and others for graphic image formats. Windows and Internet browsers use these to determine what application to open to read a file. There are many file types (over 15,000 are listed at filext.com/).
This is a list of 750 of the most common ones, which I started in 1994 to configure web servers so clients would open the correct application to read files on the web.

Since there is no central registry there are quite a few duplicates (same extension for different files). For example there are 20 different file types with an extension of .img, 18 with .art, 16 with .db and more than 20 with an extension of .dat. Only the most common use of each extension is shown. Click on the extension for a more complete list.

File extensions ending in "_" (e.g. .38_) are usually compressed files in an Install package which are expanded (e.g. to .386) by the installer.

See filext.com The File Extension Source for others. see also File Extension Help at filext.com. It explains how to get clues as to a files type based on where you got it or where it is stored on your hard disk.

The first several characters in a file may be used to determine the type of file. This may be useful if the file was created on UNIX or a Mac where the file name extensions are not required. See type-from-content below.

Multipurpose Internet Mail Extensions (MIME) types are included in the file message header by web servers. Browsers uses this to determine what program to use to display the file contents.
See MIME for more information.
The association between etensions, MIME-types and application programs is configured in windows from a "my compuer" or "windows explorer" window by selecting View > Folder Options > File Types. On macs and UNIX they are set up in your browser (e.g. Internet Explorer) under Preferences > Receiving FIles >Helpers.
Or on a Mac: Select the document and choose File > Get Info. click to show the "Open with" pane.

750 of the most common ones are listed below. See filext.com/ and Dot What!? for lists of over 15,000.

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File Extn MIME Type Start
with Descr
386 application/octet-stream Windows Enhanced Mode Driver or Swap File
001 application/x-001 FAX Datafile
0xx Electronic Navigational Charts (ENC) S57, or DX90 Cells
3gp or
3gpp audio/3gpp, video/3gpp 3rd Generation Partnership Project. Multimedia over 3rd generation wireless networks. H.263 video is the mandatory video format in 3GPP and AMR is the main audio/speech format.
7CB application/vnd.ecdis-update Electronic Chart Display and Information System (ECDIS) ENC DirectENC files
7z 7-Zip Compressed File
aa audio/audible Audible file format (audio books)
aab application/x-authorware-bin Macromedia Authorware Binary
aac audio/aac Advanced Audio Coding File. Part of MPEG-2 and MPEG-4 standard. (Apple iTunes Store)
aam application/x-authorware-map Authorware Map (Shockwave?)
aas application/x-authorware-seg Authorware Shocked Packet (Segment)
aba text/x-palm-aba AddressBook Archive (Palm)
ac3 audio/ac3 Adaptive Transform Coder 3 (relates to the bitstream format of Dolby Digital)
aco Adobe Color
acsm Adobe Content Server Message File - overdrive e-Book for reading in Adobe Digital Editions
act Office Actor or Animation Work Actors or Photoshop Color Table File
adi AutoCAD Plot File
adr application/x-msaddr Address Book
aexpk application/pgp-keys Armored extracted public key (PGP)
afl video/animaflex Font file (for Allways) (Lotus 1-2-3)
ahtml magnus-internal/cgi-advertiser
ai application/postscript Encapsulated PostScript (metafile) (Adobe Illustrator)
aif audio/x-aiff Audio Interchange File Format
aifc audio/x-aiff Audio Interchange File Format
aiff audio/x-aiff Audio Interchange File Format
aim application/x-aim AIM file - AOL Instant Messanger
ale Apple Lossless Encoder (same as m4a)
alt application/x-up-alert Menu file (WordPerfect Library)
aml Arc Macro Language
amr Adaptive Multi-Rate Codec. Speech encoding format used in GSM telephony.
ani animated cursor
ans MS Word for Windows Text with Layout
aos application/x-nokia-
9000-communicator-
add-on-software Add-On Software (Nokia 9000)
ape Monkey's audio Lossless Compression format
apk application/vnd.android.package-archive Android Package File - A zip format containing files .DEX, .ARSC, and AndroidManifest.xml to run in an android program.
apnx Amazon Page Number Index File
app Apple Macintosh Application bundle
app dBASE Application Object File
arc PC ARC Archive compressed
arj application/x-arj Compressed file archive created by ARJ or winzip
art image/x-jg, image/art AOL Johnson-Grace Compressed File and Another Ray Tracer Format
as AppleSingle
asc ASCII text
asc ActionScript Communication File - Adobe
asc application/pgp-encrypted Armored Encrypted file (PGP)
asd application/astound Autosave file (Word for Windows)
asf application/vnd.ms-asf video/x-ms-asf video/x-ms-wm Windows Media file - Advanced Systems/Streaming Format (ASF), NetShow
ashx ASP.NET Web Handler File
asm PC ASM File
asn application/astound
asp text/html, text/asp, application/x-asp, application/x-asap Active Server Pages - standard HTML documents interlaced with ActiveX script code
aspx Part of Microsoft .NET; a webpage source file. Chase Visa Statements read with Adobe Acrobat (really a pdf file). Create with Dreamweaver MX or Microsoft Visual Studio
asp File type created by the Association of Shareware Professionals.
asr video/x-ms-asf Microsoft NetShow
asx video/x-ms-asf application/x-mplayer2 application/asx Advanced Stream Redirector File (Microsoft)
asz application/astound
atrac Adaptive TRansform Acoustic Coding audio file
att AT&T Group 4
au audio/basic, audio/x-ulaw, audio/x-gsm, audio/snd 8-bit u-law [PCM] / 8000 Hz
aux ArcGIS Auxilliary File
avi video/avi, video/msvideo, video/x-msvideo Audio Video Interleave File - Windows Media Player, RealPlayer. May use sevral Codecs such as VfW (Video for Windows). Some Codecs are not supported on the Mac.
See: John McGowan's AVI Overview
avr sound
avs animation
awe pAcrobat Bookmark XML File
awk BOBO AppleWorks or UNIX awk script
axd text/plain ASP.NET Web Handler File
axs application/olescript ActiveX Script
azw application/octet-stream Amazon Kindle e-book File

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File Extn MIME Type Start
with Descr
b64 WinZip
bac binary backup
bak Backup file
bas text/plain BASIC program
bat application/octet-stream DOS BAT (Batch) file.
bbm image
bck VMS backup
bcpio application/x-bcpio Old Binary CPIO
bexpk application/pgp-keys binary extracted public key (PGP)
bfc briefcase
bib BibTeX Bibliography
big Chinese Traditional text coding (old version)
big5 Chinese Traditional (old version)
bin application/octet-stream Uninterpreted Binary Data
bin application/x-macbinary Binary file
bk application/vnd.framemaker FrameMaker book
bleep application/bleeper
bmf Binary Material File
bml Bean Markup Language, a set of Java classes that provide scripting language.
bmp image/x-bmp, image/x-MS-bmp, image/x-mspaint, image/x-win-bmp Windows Bitmap (PaintBrush)
boo image
brw Oracle Browser
bst BibTeX Style Files
btf image/prs.btf NationsBank Check Images (also .btif)
byu movie byu file
bup Backup DVD Info File
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c text/plain C program
c++ text/plain C program
cab application/cab, application/x-cabinet-
%opersys%-%cpu% Cabinet file Microsoft installation archive. opersyss=win32, mac cpu=x86, ppc, mips, alpha
cag Clip Art Gallery - PowerPoint
cal application/x-msschedplus MS schedplus or calendar
cat application/pdf PDF Catalog (Used with Acrobat Reader and Search plug-in)
cat application/vnd.ms-pki.seccat Security Catalog
cat Quicken IntelliCharge Categorization File
cch Corel Chart
ccs text/ccs Cluster Configuration System used with the Global File System (GFS) in Red Hat Linux
cdda audio/aiff CD Audio Track
cda audio/x-cda CD Audio Track
cdf application/x-netcdf Channel File, Unidata netCDF data file
cdf text/plain, application/x-cdf Channel Definition Format - MS push std
cdr ISO CD/DVD Disk Image File on a Mac (see also .iso, dmg, cso, dax)
cdr application/x-coreldrw Corel Draw (metafile)
cer application/pkix-cert, application/x-x509-ca-cert Internet Security Certificate
cfg Configuration file used by many programs. No standard format.
cfl COREL flow
cfm wwwserver/wsapi Cold Fusion Markup
cfs ColdFusion IIS plugin IICF.DLL)
cgi magnus-internal/cgi, wwwserver/shellcgi Common Gateway Interface
cgm image/cgm Computer Graphics Metafile ISO/IEC 8632
chat application/x-chat
che application/x-up-cacheop
chm Compiled HTML
cht audio/x-dspeech Chart (Harvard Graphics 2.0 - SoftCraft Presenter)
cil application/vnd.ms-artgalry Clip Gallery Download Packages
class application/java-vm, application/octet-stream Java
cli application/vnd.ms-artgalry
clm Magic Jack call log
clp image/x-clp Clip art graphics (Quattro Pro)
clp application/x-msclip Windows Clipboard (metafile)
cmd Windows NT and 95 CMD files (similar to bat in DOS)
cmf music
cmx drawing/cmx
image/x-cmx Corel Presentation Exchange, Corel Metafile Exchange
cnc application/x-cnc CNC general program /fsta
cnf converter
cnt Help File Contents
cnv Canvas Ver 6, 7, ... Image (free Canvas 9 Viewer at ACD Systems)
cnv Word Data Conversion File
cod image/cis-cod Datafile (Forecast Plus - MS Multiplan - StatPac Gold)
coda application/x-coda
com application/octet-stream DOS COM Executable (similar to exe, but a direct memory image)
con QuickTime .mov on Disney server returns extension .con or.c
conf Configuration File - Linux
cpi Windows or DOS International Code Page
cpi image/cpi ColorLab Processed Image
cpio application/x-cpio IEEE Std1003.2 (`POSIX') CPIO
cpl Control Panel extension
cpp C++ source files
cpt application/mac-compactpro Compact Pro Archive
cr2 Canon Raw Image Format
crd application/x-mscardfile MS cardfile
crt application/x-x509-ca-cert Certificatefile
crx Chrome Extension
csh application/x-csh CSH Script
cso CISO Compressed ISO disk image (DevHook & PlayStation (psp) iso compressor application)
css application/x-pointplus Datafile (CSS - Stats+)
css text/css Cascading Style Sheets
csv text/csv, application/csv, application/x-csv Comma-Separated Values (Excel, Lotus 123, FoxPro, MS Outlook)
ct image/ Iris CT Graphic or Scitex CT Handshake Bitmap
cu application/x-cu-seeme
cur cursor image
cut image/x-halo-cut Bitmap graphics
cv5 Canvas Version 5 Image
cwk BOBO Claris Works or AppleWorks
cxt Macromedia Director Protected Cast File
cxx C++ source files

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Movie Encoded with DivX-codec
File Extn MIME Type Start
with Descr
dat application/octet-stream Data file. Can be anything, text, graphics, binary, ...
dat application/ms-tnef MicroSoft Transport Neutral Encapsulation Format. When an end user sends mail to the Internet from an Exchange Windows or Outlook client (not outlook express), a file attachment called WINMAIL.DAT may be created with Exchange Server RTF information for the message. Programs like WMDecode and Fentun can be used to recover any attachments from the WINMAIL.DAT file. Some mail programs will automatically extract the contants e.g. a MS Word (.doc), Excl (.xls), Windows Media Video (wmv) or other binary document.
dat Digital Audio Tape. Get VLC Media Player at www.videolan.org/ for Mac
dat video/dvd, video/mpeg Video CD MPEG or MPEG1 Movie
db Database. There are at least 16 different applicataion using the extension, usually for a database file.
dba text/x-palm-dba DateBook Archive (Palm)
dbf application/octet-stream DataBase File (FoxPro, dBase)
dbm wwwserver/wsapi ColdFusion IIS Plugin
dca application/dca-rft IBM Doc Content Arch
dcf dKart Charts www.openecdis.org
dcr application/x-director Macromedia Director (Shockwave)
dcr digital camera - Kodak Digital Camera Raw Image File
dcs image
dct Dictionary file used by various programs (Adobe Illustrator, Clarion, .. )
dct Express Dictate's audio file (Note: DCT - discrete cosine transform, is a pict and video compression algorithm which is different)
ddb Device-Dependent Bitmap
ddf Dynamic Data Format (https://www.stsci.edu/stsci/meetings/adassIV/conroym.html)
deb application/octet-stream Binary for debian UNIX
der application/x-x509-ca-cert Certificatefile
des text
dex Bytecode to run in the Android Runtime (ART) virtual machine.
dfont Mac Datafork TrueType Font
dib Device Independent Bitmap. A .BMP file without .BMP header.
dic Dictionary
dif Data Interchange Format - a general spreadsheet format
dig text
dir application/x-director Macromedia Director (Shockwave)
divx Movie Encoded with DivX-codec
djv image/vnd.djvu Movie Encoded with DivX-codec
djvu image/vnd.djvu DJVU image (AT&T compression)
dl PC DL Movie
dlg image
dll application/x-msdownload, application/x-pe-
%opersys%-%cpu% Dynamically Linked Library (DOS) pe-portable executable opersys=win32, mac cpu=x86, ppc, mips, alpha
dl_ compressed .dll in Install package
dmg Disk Image (Apple)
dms application/octet-stream Compressed Amiga file archive created by DISKMASHER
dng Digital Negative - Adobe
dnl DNAML e-Book File. Protected using
digital rights management (DRM)
dnp DRM File
do Stata Batch File
doc application/msword, application/doc MS Word
docx application/presentations, application/doc Word Microsoft Office Open XML Format Document (Office 2007)
dot application/msword MS Word (Template)
dox Multimate 4
dp DAVIN
drv Device Driver
drw Micrografx Designer 3.1 (metafile)
dsf image/x-mgx-dsf Micrografx Designer 6 (metafile)
dsp Rumba TN3270 session profile
dst application/tajima PC-RDist Distribution file
dta Stata Data File
dtd text/xml SGML Document (Type) Definition file
dtl Django Template Language
dus audio/x-dspeech Readiris font dictionary
dvi application/x-dvi TeX DVI (Device Independent)
dwc application/dwc compressed archive
dwf drawing/x-dwf Autodesk WHIP! Drawing Web file
dwg application/x-acad, application/vnd.dwg, image/vnd.dwg, application/x-dwg, application/x-autocad AutoCAD Drawing
See History of CAD
dwg Drawing (Drafix)
dwt DreamWeaver template and AutoCAD Template/Prototype
dxf application/vnd.dxf Drawing eXchange Format, Data Exchange File, AutoCAD (vector)
dxr application/x-director Macromedia Director (Shockwave)

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File Extn MIME Type Start
with Descr
ebk application/x-expandedbook
ece used by the The Independent News in the UK. May be some kind of scripting language.
efx eFax Fax Document (J2 Global Communications efax.com
emf image/x-emf Enhanced metafile created in Microsoft Windows and Visio 2002 applications
eml message/rfc822 MS Internet Mail Message (Outlook Express and others)
emlx message/rfc822 Mac OS X mail message
emz .emf file compressed with gzip
enc application/pre-encrypted Pre-encrypted Data (also Sniffer trace)
enex Evernote export/archive
eot application/octet-stream Embedded OpenType Font
eps application/postscript Encapsulated PostScript (raster)
epub application/zip Open e-book file. An XML format for reflowable digital books and publications. From the International Digital Publishing Forum. Actually a zip doc.
erf application/x-hsp-erf
es audio/echospeech
etf image/x-etf Enriched Text file
etx text/x-setext Structure Enchanced Text
euc Japanese (Kanji)
evy application/x-envoy Document (WordPerfect Envoy)
exe application/exe, application/octet-stream, application/x-msdownload Directly executable program (DOS)
ex_ compressed .exe in Install package
exe application/x-pe-
%opersys%-%cpu% pe-portable executable opersys=win32, mac cpu=x86, ppc, mips, alpha
exif Exchangeable Image File format for digital cameras. JPEG file with Exif metadata. Not actually an name extension but a special type of .jpg
exr OpenEXR Image - Industrial Light & Magic
F
f Freeze Compressed File Archive (UNIX)
fac picture
fbc FamilyTree Compressed Backup File
fdd Parallels floppy disk image
fdf application/vnd.fdf Acrobat Portable Document Input Form
fh4 image/x-freehand Vector graphics (Aldus FreeHand 4.x)
fh5 image/x-freehand Freehand 5
fhc image/x-freehand Freehand
fif image/fif Fractal Image Format file
fif application/fractals Fractals
fits image Flexible Image Transport System. GeoTIFF
fla application/x-shockwave-flash
flac audio/flac Free Lossless Audio Codec
flc video/flc FLIC Animated Picture Autodesk
fld fLd Player Video (YouTube videos). Flash type but may need separater fld player.
fli video/fli FLIC Animated Picture Autodesk
flt filter - e.g. Graphic inport filter for Word
flv video/x-flv Flash Video File
flx MicroSurvey CAD Drawing File
fm application/filemaker_pro FileMaker Pro (also used with FrameMaker 3)
fm application/vnd.framemaker FrameMaker Document
fm3 application/x-maker FrameMaker
fm3 FileMaker 3 Database Document
fm3 Lotus 1-2-3 Format File
fm4 application/vnd.framemaker FrameMaker
fm5 application/vnd.framemaker FrameMaker
fml application/fml
fon Windows 3.x font library file
fot Installed TrueType Font
fpbf Finder Backup Burnable Archive - tar-format archives on Mac OS X
fpx FlashPix format for storing digital images developed by Kodak
fp5 application/filemaker5 FileMaker Pro
frl application/freeloader FormFlow file
frm application/vnd.framemaker FrameMaker
fs application/X-FSRecipe
fssd sound
ftw FamilyTree Maker

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File Extn MIME Type Start
with Descr
g3f image/g3fax Group III FAX
gb application/chinese-gb
text/x-chinese Chinese Text
gds image
gdb GeoDatabase, GPS Database
ged GEDCOM Family History File
gem Venture Publisher, GEM Draw (vector)
gif image/gif GIF GIF - Graphics Interchange Format - Compuserve (raster)
gl animated picture
gmf graphic
gph Stata Graph File
gpx GPS eXchange format. EasyGPS
gry picture
gsc GeneStudio File - (Molecular Biology Software)
gsd audio/x-gsm GSM Internet Realtime Audio
gsm audio/x-gsm, application/x-gsm Raw GSM 6.10 Audio Stream
gtar application/x-gtar Gnu Tar
gz application/x-gzip, application/x-compressed Unix Gzip (gnu-compress ecnapsulation)
gzip compressed
H
h C Header
ha compressed
ham image
hdd Parallels Desktop Hard Disk File
hdf application/x-hdf NCSA HDF (Hierarchical Data Format)
hdml text/x-hdml
heic iOS High Efficiency Image Format
hgl HP Graphics Language
hlb vms/help VMS help libraries
hlp application/x-mshelp Windows Help
hpgl application/vnd.hp-HPGL HP Graphic Language
hpk compressed
hqx application/mac-binhex40 BinHex 4.0 Format - Macintosh Binary to ASCII conversion.
hrz image
htm text/html HTML - HyperText Markup Language
html text/html HTML - HyperText Markup Language
htt Hypertext templates. GoLive, FrontPage
htx Extended Hypertext Template - MS HTML extension files
hyp compressed
hz application/chinese-hz Chinese

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File Extn MIME Type Start
with Descr
ibm picture
ica application/x-ica Bitmap graphics (Image Object Content Architecture)
ice x-conference/x-cooltalk Cooltalk Audio
icm Image Color Matching File
ico image/ico, image/x-icon Windows icon
icq application/x-icq Saved ICQ Contact Information. From IRQ Chat Groups, Lists, Boards, Lists, IrCQ-Net Chat.
ics text/calendar Calendar Data (iCal - Mac; Outlook or Windows)
idc Internet Database Connector
ief image/ief Image Exchange Format
iff image/iff Amiga Bitmap Graphic
ifo DVD Info File
iges
igs model/iges Initial Graphics Exchange Specification. ANSI-approved standard format used with 3D wire frame models.
Mac: CADintosh from Lempesoft.com or Win: igsviewer.com
igs model/iges, image/x-igs, application/iges, application/x-igs IGES - Initial Graphics Exchange Specification Format
img image/img Venture Publisher, GEM Draw (bit mapped), AutoCAD CAD-Camera, others
img Apple Macintosh Disk Copy Format, HDCopy Pro hard disk images
imi Magellan GPS detailed map
ini text/plain Initialization/Configuration File for MS Windows. Many programs now use the registry (Windows NT and later) instead of .ini files.
inc text/plain
indd InDesign Document (Adobe)
inf application/x-setupscript Setup scripts (For Installing Drivers, etc.), Autorun - auto-start file for a CD-ROM
ins application/x-NET-Install Data (WordPerfect)
ipix Interactive Pictures www.ipix.com
ips application/ips, application/
x-ipscript Game Patch file
ipx application/x-ipix IPIX AV file
isapi wwwserver/isapi Internet Server API - Application Program(ming) Interface
ish compressed
iso Disc Image saved in ISO-9660 format (Easy CD Creator, Nero, Roxio)
ivr i-world/i-vrml Virtual Reality World Live Picture
iw4 DjVu File

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jar application/java-archive
jas JASC JAS Compressed : Bitmap graphics
java text/plain
jbig image
jfi image
jfx application/octet-stream eFax Fax Document (J2 Global Communications jconnect.j2.com/
jis Japanese
jpc picture
jpe image/jpeg JPEG-JFIF - Joint Photographic Experts Group
jpeg image/jpeg JPEG-JFIF - Joint Photographic Experts Group
jpg image/jpeg JPEG-JFIF - Joint Photographic Experts Group (raster)
jps image/x-jps Stereo Image
js application/x-javascript Java Script
jsc application/x-javascript-config
json aplication/json Java Script Object Notation
jsp magnus-internal/jsp Java Script
jspx XML Java Server Page
jso Compressed disk image - PSP ISO Compressor
K
key application/
x-iwork-keynote-sffkey Mac iWorks keynote presentation program. Includes slides, images, text, transitions.
kf8 Kindle Format 8 - Kindle fire e-Book format
kml application/vnd.google-earth.kml+xml KeyHole Markup Language (Google Earth, ArcGIS Explorer, MS Virtual Earth)
ksh K (Korn) shell
L
la audio/nspaudio Netscape Packetized audio
lam streaming audio metafiles
latex application/x-latex LaTeX Source
lbm image
lbr library compressed
ldif text/x-ldif LDAP Data Interchange Format ( Netscape Address Book)
lex Lexicon (Dictionary)
lha application/octet-stream LHA Archive
lis program listing
lgo Modern ListGeo Output. GeoTIFF
lm8 picture
lma audio/nspaudio Netscape Packetized audio
lng Acrobat Language Plug-in
loc application/octet-stream GPS Location File - TopoGrafix
loe application/vnd.framemaker FrameMaker list of exhibits
lof application/vnd.framemaker FrameMaker list of figures
lot application/vnd.framemaker FrameMaker list of tables
lpr FrameMaker list of tables
or Homeworld
lpr Kindle position informataion
lwp WordPro 9.5
lzh application/octet-stream compressed
lzs application/octet-stream compressed
lzw LHWarp archive
lzx application/octet-stream compressed

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m13 application/x-msmediaview MS mediaview
m14 application/x-msmediaview MS mediaview
m2ts video/ Blu-ray BDAV MPEG-2 Transport Stream
m3u audio/x-mpegurl
audio/mpeg-url MP3 Playlist (Musicmatch, WMP, Winamp, ...)
m4a audio/ MPEG-4 audio file. Apple iTunes AAC and ALE unprotected
m4b audio/ MPEG-4 Audio Layer Bookmarkable File. Apple iTunes AAC and ALE unprotected
m4v H.264 MPEG-4 Video File
m4p audio/ Apple iTunes AAC protected
m4b audio/ Apple iTunes AAC protected autiobook
ma application/mathmetica Mathmetica Notebook
mac Rumba VT420 (SPRY Telnet) TN3270 macro
mag picture
man application/x-troff-man Troff w/MAN Macros
map application/x-httpd-imap, magnus-internal/imagemap Image Configuration File (HTML Image Map)
mat sound
mbd application/mbedlet Multimedia Builder Project File
mbp Mobipocket Notes File
mcf image/vasa Mathcad font
mcf Meta Content Format File
mcw MS Word in Mac format
md compressed
mda application/x-msaccess MS Access (May not be desirable)
mdb application/x-msaccess MS access
mdf SQL Server Master Database File
me application/x-troff-me Troff w/ME Macros
med Amiga Med Sound
mem dBase Memory File
mesh model/mesh
mfc Microsoft Foundation Classes
mfp application/mirage
mgf image
mgi Magellan GPS background map
mhg multimedia
mht message/rfc822 Microsoft Web Archiv
mic Microsoft Image Composer
mid audio/x-midi MIDI
midi audio/x-midi MIDI
mif application/vnd.mif, application/x-mif Maker Interchange Format (FrameMaker)
mime message/rfc822 base64 (6-bit) is the standard for encoding binary attachme
mix Microsoft Picture It
mk application/vnd.framemaker FrameMaker
mki picture
mkv Matroska Video File
mlp MacLinkPlus Print Capture File
mmf application/x-smaf
application/vnd.smaf SMAF = "Synthetic music Mobile Application Format" - Polyphonic Ringtone File for Phones - Yamaha
mmf MS Mail file
mml Maker Markup Language
mmm application/pdf Acrobat Media Clip
mny application/x-msmoney MS money
mobi application/x-mobipocket Mobipocket e-book file, Gutenberg kindle book
mocha application/x-javascript Java Script
mod Amiga Mod Sound
mol chemical/x-mdl-molfile MDL Molfile
mov video/quicktime H.264 QuickTime digital video
movie video/x-sgi-movie SGI "movieplayer" movie
mp2 audio/mpeg MPEG Audio Stream, Layer II
mp3 audio/mpeg, audio/x-mpeg3,
audio/mpg MPEG Audio Stream, Layer III
mp4 video/mp4v-es, audio/mp4 H.264 MPEG Audio Stream, Layer IV (QuickTime and RealPlayer)
mpa audio/mpeg MPEG Audio Stream, Layer I, II or III
mpa text/x-palm-mpa MemoPad Archive (Palm)
mpd Windows Mini-port Driver
mpd File List Creator MP3 Playlist
mpe video/mpeg MPEG - Motion Picture Experts Group
mpeg video/mpeg MPEG - Motion Picture Experts Group
mpg video/mpeg MPEG - Motion Picture Experts Group
mpga audio/mpeg
mpire application/x-mpire
mpkg Meta Package File - Installer archive (linus, Mac)
mpl application/x-mpire
mpp application/vnd.ms-project MS Project
mps multimedia
mpt application/vnd.ms-project MS Project
mpv application/vnd.ms-project MS Project view
mpw application/vnd.ms-project MS Project
mpx application/vnd.ms-project MS Project
mrb image
mrw digital camera - Minolta Diamage Raw Image File
ms application/x-troff-ms Troff w/MS Macros
msi text/mspg-legacyinfo
application/x-ole-storage D0 CF Windows Installer File
msh model/mesh 2 and 2-D visualization
mso MS Office Macro Reference File
msp MS Paint
mspx XML-based Web Page
mtm sound
mtp Microsoft Team Manager file
mts MPEG Transport Stream - Advanced Video Codec High Definition (AVCHD) - High-definition MPEG Transport Stream video format
mtv MTV Video Format File
mu Mac UUencoded

N-O ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z

File Extn MIME Type Start
with Descr
n2p application/n2p
nc application/x-netcdf Unidata netCDF data file
nef digital camera - Nikon Digital SLR Cameras Raw Graphic File Format
nff image
ngg Nokia Group Graphics - Mobil Phone Logo
nol Nokia Operator Logo - Mobil Phone
npx application/x-netfpx
nsc application/x-nschat Noder file (Polish)
nsf application/x-notes Lotus Notes
nst sound
ntf application/x-notes Lotus Notes
num-
bers Mac iWorks spread sheet
nv networked video
nws Net News
nzb newzBin USENET Index
O
obd Office Binder file
obj PC Compiled Object File
obt Office Binder template
ocx application/x-oleobject Object Linking and Embedding (OLE) Control Extension (ActiveX Control)
oda application/oda ODA/ODIF ODF Open Document Architecture
odf ODA/ODIF Open Document Architecture / ODF Open Document Interchange Format OpenOffice.org, Libre Office, StarOffice Calc
odg application/vnd.oasis
.opendocument.graphics OpenOffice/StarOffice ODF OpenDocument (Ver 2) Graphics Document
odp application/vnd.oasis
.opendocument.presentation OpenOffice/StarOffice ODF OpenDocument (Ver 2) Presentation
ods ODF OpenDocument Spreadsheet - LibreOffice, OpenOffice
odt application/vnd.oasis.-
opendocument.text OpenDocument Text - An open XML-based document file format for office applications to be used for documents containing text, spreadsheets, charts, and graphical elements. Approved as an OASIS (Organization for the Advancement of Structured Information Standards) Committee Specification. OpenOffice/StarOffice OpenDocument, LibreOffice
off Object File Format, 3D images, (apps MeshLab, GLC_Player, RoffView
ofml application/fml
ofx Open Financial Exchange (Quicken, MS Money, ..)
ogg audio/x-ogg Ogg Vorbis open-source audio format
ogv video/ogg Video file that uses the Xiph.Org's open source Ogg container format
olb vms/olb Vax Object Library or MS Project Object Library
omf image
opd OmniPage Document
opf e-book Systems FlipAlbum
opw Org Plus Org Chart
opx MS Org Chart
or2 application/x-organizer Lotus Organizer
orf digital camera - Olympus Raw Image File
osd Open Software Description - MS softwr distribution
ost Offline Folder file
otf pplication/vnd.ms-opentype Open Type Font
other Unknown
ovl application/octet-stream PC OVL File
owl Web Ontology Language
oxt OpenOffice.org Extension

P ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z

File Extn MIME Type Start
with Descr
p12 Certificate file
p7c Certificate file
p7m application/pkcs7-mime S/MIME signedData, envelopedData
p7s application/pkcs7-signature PKCS #7 Signature
p10 application/pkcs10 S/MIME Certificate Request
pac application/x-ns-proxy-autoconfig
page application/x-coda
pages PK Mac iWorks pages word processor
pak compressed
pal Palettes
pat Hatch patterns (AutoCAD - Photostyler)
pat Vector fill files (CorelDRAW)
pbd application/vnd.powerbuilder6 Phone book (FaxNOW! - Faxit)
pbm image/x-portable-bitmap PBM Bitmap Format
pcc PC PaintBrush
pcd image/x-photo-cd Kodak Photo CD (raster)
pcl application/pcl, application/x-pcl Printer Control Language (HP)
pcm sound
pct Macintosh QuickDraw format (PICT) (metafile)
pcx image/pcx PC Paintbrush (ZSoft Image)
pdb chemical/x-pdb Chemical Objbect
pdb text/x-palm-pdb Palm Database/Document File. Used by nook for e-Books
pdf application/pdf Portable Document Format (Adobe Acrobat)
pdr Port Driver
pds Print Shop Graphic
pds NASA Planetary Data System Format Space Mission Data
pem application/application/x-pem-file Privacy Enhanced Mail Security Certificate
pf Aladdin Systems Private Files Encrypted File or Archive file
pfm application/pdf Acrobat Font
pfr application/font-tdpfr
pgl HP 7475A Plotter (vector)
pgm image/x-portable-graymap PBM Graymap Format
pgp application/x-pgp-plugin Support file (Pretty Good Privacy RSA System)
pgp application/pgp-encrypted PGP Encrypted file
pgr text/parsnegar-document
phl Kindle Popular Highlights File
php application/x-httpd-php, text/php, application/php, magnus-internal/shellcgi, application/x-php PHP Script
php Host Presenter (Novell Telnet) profile
php3 application/x-httpd-php3
phtml application/x-httpd-php PHP Script
pic application/pic Lotus Chart
pic image/pict Macintosh QuickDraw format (metafile)
pict image/pict Macintosh QuickDraw format (metafile)
pif application/x-mspif Program Information File (Windows)
pit Macintosh compressedB
pix Inset Systems PIX (raster)
pjl Printer Job Language
pkg AppleLink Archive
pkr application/pgp-keys Public Keyring (PGP)
pkt EtherPeek Packet Dump
pl Perl script
pls audio/x-scpls MPEG PlayList (Real Audio, Napster)
plist Property List XML File using Apple�s plist DTD (Document Type Definition)
plt HP Plotter (HPGL) Print File
pm PageMaker Document, Perl Module, Presentation Manager Graphic
pmd, pm3, pm4 PageMaker document
pnc text/x-palm-pnc Palm Network Configuration File
png image/png, image/x-png Portable Network Graphics (Replacement for gif with 65K colors) (lossless storage format)
pnm image/x-portable-anymap PBM Anymap Format
pnt MacPaint
pol music
pot application/ms-powerpoint MS PowerPoint template
pp Amiga compressed
ppa application/vnd.ms-powerpoint MS PowerPoint addin
ppm image/x-portable-pixmap PBM Pixmap Format
pps application/ms-powerpoint MS PowerPoint Slideshow
ppsx Power Point Microsoft Office Open XML Format Presentation Slide Show
ppt application/ms-powerpoint MS PowerPoint Presentation
pptx application/presentations MS PowerPoint XML format (Office 2007)
ppz applications/ms-powerpoint MS PowerPoint Animation
pqa text/x-palm-pqa Palm Query Application
pqf application/x-cprplayer
pqi application/cprplayer Power Quest Drive imaging
prc application/vnd.palm Palm Application
prc application/x-mobipocket Mobipocket e-book file
prg dBase program
prj ArcView ESRI (Environmental Systems Research Institute) Coordinate System Definition
prl Perl Script
prn Fixed 'Print' file format, usually a space delimited values data file
pro DOS Graphics Profile File
prn HP Printer Control Language
prvkr application/pgp-keys Private Keyring (PGP)
ps application/postscript PostScript
psd application/x-photoshop Adobe PhotoShop Document
psf Photoshop Proof Setup
psid picture/text
psr application/datawindow Project Scheduler Resource file
pst Personal storage/folder file
ptlk application/listenup
pub application/x-mspublisher MS publisher or PageMaker 2
pub Ventura Publisher (Corel)
pubkr application/pgp-keys Public Keyring (PGP)
push multipart/x-mixed-replace
pvs Parallels Desktop Configuration File
pwd password (AIR FTP, AUTODESK)
pwd Portable Word Document
pwl Windows Password List
pwp PhotoWorks Package
pxr Pixar Image File
py Python Script

Q-R ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z

File Extn MIME Type Start
with Descr
q JB2
qd3 x-world/x-3dmf Data file - segment 3 (Omnis Quartz)
qd3d x-world/x-3dmf
qif Quicken Interchange format
qrt application/quest Qrt ray tracing graphics
qt video/quicktime QuickTime
qxd application/quarkxpress QuarkXpress Document
qfx Quicken Transfer Format
qxp application/quarkxpress QuarkXpress Project
R
ra audio/x-realaudio Music (RealAudio)
raf digital camera - Fuji CCD-RAW Graphic File
ram audio/x-pn-realaudio, video/x-pn-realvideo RealMedia Metafile
rar WinRAR Compressed Archive (Roshal ARchive)
ras image/x-cmu-raster Sun Raster Format (raster)
raw animated picture or Raw Image File
rax audio/ RealAudio 10 - RealMedia Streaming File
rdf Resource Description Framework - Meta about resources on the web. See web 3.0.
rfa Revit Family File - 3D model - Autodesk
rft text/richtext, text/rtf, application/rtf, application/msword DCA-RFT -Document Content Architecture, Revisable Form Text
rgb image/x-rgb RGB Color Image
rib RenderMan 3D data
rip Quincy for Win32 - Abnormal Termination Report
rip image/rip Graphics (Remote Access)
rle Windows/OS/2 Bitmap (picture)
rm application/vnd.rn-realmedia
audio/x-pn-realaudio
Real Media
rmf Rich Map Format - used in various 3-D games to store maps
rmf audio/x-rmf Rich Music Format audio file from Beatnik
rmi audio/mid MIDI File
rmvb application/vnd.rn-realmedia-vbr RealVideo Variable Bit Rate FIle
rng application/ringing-tones
application/vnd.nokia.ringing-tone Nokia Phone Ringtone File
roff application/x-troff Troff
rol sound
rpm audio/x-pn-realaudio-plugin Real Audio Plugin and RedHat Package Manager
rrf application/x-InstallFromTheWeb
rsrc Mac Resource File
rss Rich Site Summary or "Really Simple Syndication". A lightweight XML format designed for sharing news headlines.
rtc application/rtc
rte Magellan GPS Route file
rtf application/rtf Rich Text Format (Microsoft)
rtttl text/richtext Ring Tones Text Transfer Language File
rtx text/richtext MIME Richtext format (see also rtf)
rtx extended ringtone format - Mobil Phone
rtsp application/x-rtsp QuickTime Real-Time Streaming Protocol File
rx Hummingbird X Web Remote Activation

S ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z

s3m sound
sam Ami Pro
sav SPSS Data File
sb application/x-xsb Superbook
sbn ArcView Spatial Index For Read-Write Shapefiles (GIS)
sbx application/x-xsb ArcView Spatial Index For Read-Write Shapefiles
sca application/x-supercard Datafile (SCA)
scm ScreenCam
scp text/x-palm-scp Palm Network Script File
scp text/x-palm-scp Palm Network Script File
scr Screen Font
scr Screen Saver (executable)
scx image
sdn shell archive
sdp application/sdp Scalable Multicast (RealNetworks)
sea Self Extracting Archive
ser application/java-
serialized-object
ser Metamail Server File
sf IRCAM Sound
sgi picture
sgl SCODL
sgm text/x-sgml Standard Generalized Markup Lang (SGML)
sgml text/x-sgml Standard Generalized Markup Lang (SGML)
sh application/x-sh SH Script
shar application/x-shar Sh Shar
shg image
shk compressed (Mac)
shp SRI GIS & Mapping Software Shape File - ArcView
shn Shorten Audio Compression File
shx ArcView DataBase Index
shtml magnus-internal/parsed-html
shw application/presentations Presentation (Harvard Graphics 2.0 - CorelShow)
sif Windows NT Setup File
sig application/pgp-signature Detached signature file (PGP)
silo model/mesh
sit application/x-stuffit StuffIt - Macintosh Compression Format. By Aladdin for Mac.
sitx application/x-stuffit StuffIt X file format integrates compression with security and safety options. By Aladdin for Mac.
sithqx StuffIt BinHex Archive
skd application/x-koan
skm application/x-koan
skp application/x-koan
skr application/pgp-keys Private Keyring (PGP)
skt application/x-koan
sla Scribus document (page layout)
slk (.SYLK) Symbolic Link WingZ/Excel/Lotus (old MultiPlan form)
smi Self Mounting Image file (Disk Copy Apple)
smil application/smil SMIL Synchronized Multimedia Integration Language. App:RealPlayer
smf Standard MIDI File
smf OpenOffice.org Formula
sml application/smil SMIL Synchronized Multimedia Integration Language
smp application/studiom Sample (sound file)
snd audio/basic 8-bit u-law [PCM] / 8000 Hz Audio
snp application/vnd.ms-access MS Access Snapshot
spc text/x-speech SpchComp Encoded Speech/Audio
spc application/x-pkcs7-certificates PKCS #7 Certificate
spc text/x-palm-spc Palm Configuration File
spl application/futuresplash FutureSplash from FutureWave Sftwr
spo SPSS Statistical Output File
spr application/x-sprite Document letter (Sprint)
sprite application/x-sprite
spss SPSS Script File
sql Structured Query Lang
sqz squeeze for MSDOS
src application/x-wais-source WAIS Source
srv BNBSURVEY Configuration File
stk application/hstu
stm Microsoft - Exchange Server Streaming Store
stm The .stm extension tells an NT web server (Site Server 3.0) to look for #include directives.
stream audio/x-qt-stream
stw OpenOffice Template
sty application/msword MS Word Style sheet
sum Stata Checksum File
sup Supplemental Data, Usually a form of user dictionary.
sv4cpio application/x-sv4cpio SVR4 CPIO
sv4crc application/x-sv4crc SVR4 CPIO w/CRC
svf image/vnd
svg image/svg+xml Scalable Vector Graphics
svh image/svh
svr x-world/x-svr Compressed Virtual World
swa application/x-shockwave-audio, application/x-director Shockwave Audio
swf application/x-shockwave-flash
image/vnd.rn-realflash Macromedia Flash Format File for animations
sxc OpenOffice Spreadsheet
sxw OpenOffice
syl application/sylk SYLK - Symbolic Link WingZ/Excel/Lotus (old MultiPlan form
sys application/octet-stream PC System File

T-U ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z

File Extn MIME Type Start
with Descr
t application/x-troff Troff
tab Tab separated Text (usually .tsv)
talk application/talker, text/x-speech Text to Speech
tar application/x-tar 4.3BSD Tar
targa image/targa Targa Image File
taz Unix Tar.Z Archive
tbk application/toolbook Memo backup (dBASE IV - FoxPro)
tcl application/x-tcl TCL Script
tda text/x-palm-tda ToDo Archive (Palm)
tdo compressed
tex application/x-tex TeX Source
texi application/x-texinfo Texinfo
texinfo application/x-texinfo Texinfo
tga image/targa Targa/Truevision Image File
tgz application/x-gzip UNIX GTar Arvhive
tif image/tiff TIFF - Tag Image File Format. Includes GeoTIFF (lossless storage format)
tiff image/tiff TIFF - Tagged Image File Format
tlb Type Library (SPSS, OLE, Visual C++)
tlk application/x-tlk
tmv application/x-Parable-Thing Template (TextMaker)
toc application/vnd.framemaker FrameMaker TOC
tor Lomax Software Info File
tor-
rent application/x-bittorrent BitTorrent Metainfo File. Shareaza, BitComet
tpg National Geographic TOPO! mapsmapXchange Document
tpo National Geographic TOPO! mapsmapXchange Document
tpp TOPO! reference file
tps Temporary Postscript - FrameMaker
tr application/x-troff Troff
trm application/x-msterminal MS terminal
trn TeleChart trendline file
trn SQL Server Transaction Backup and others (Pagemaker, Quattro, ...).
ts terminal settings (eXceed telnet)
tsi audio/tsplayer
tsp application/dsptype Windows Telephony Service Provider
tsv text/tab-separated-values Tab Separated Values
tsz TOPO! mapping software
ttf TrueType Font
tx8 DOS Text
txt text/plain Plain Text
txt application/wordperfect WordPerfect 6-11
U
u98 Urdu 98 Document
u3p U3 Smart Application for SanDisk U3 SmartDrive. zip format with .exe
uc2 UltraCompressor II compressed archive
UDF Universal Disk Format - This is a file system coding standard for CD's and DVDs. I have never seen a file with this extension type.
udf SQL User Defined Function Script file.
udf Excel user defined function.
uin application/x-icq ICQ 2001+ Saved ICQ Contact Information
ul sound
um uuencoded
upd Universal Print Driver
upt Magellan GPS WayPoint (POI) file
url application/x-url wwwserver/redirection application/internet-shortcut Uniform resource Locator (Internet Address)
ustar application/x-ustar IEEE Std1003.2 (``POSIX'') Tar
utl sound
uu uuencoded (7-bit)
uud uudecoded
uue uuencoded
V ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z
File Extn MIME Type Start
with Descr
v5d application/vis5d 5-D data set visualization
vat video audio tool
vbd application/activexdocument ActiveX file
vcs text/x-vcalendar Personal Data Interchange (PDI) Calendar entry - Outlook
vcd VisualCAD Drawing file
vcd application/x-cdlink VirtualDrive CD Image File
vcf text/x-vcard vCard (Business Card)
vdo video/vdo VDOLive Script Video image (Story Board)
vgm video/x-videogram
vfd Virtual Floppy Drive Image
vgp video/x-videogram-plugin
vgx video/x-videogram
vic VICAR (Video Image Access and Retrieval) raster image
vis Visual Importer Script
viv video/vnd.vivo VivoActive Player Video file
vivo video/vnd.vivo
vlc application/videolan VLC Media Player Data.
vmd application/vocaltec-media-desc
vmf application/vocaltec-media-file Font characteristics (Ventura Publisher)
vnt text/x-vnote Mobile Phone vNote File - QUOTED-PRINTABLE QP format
vob video/dvd, video/mpeg DVD Video Movie File
voc sound
vox audio/voxware Vox Audio
vqe audio/x-twinvq-plugin Yamaha Sound-VQ Locator file
vqf audio/x-twinvq Yamaha Sound-VQ file
vql audio/x-twinvq Yamaha Sound-VQ Locator file
vrml model/vrml Virtual Reality Modeling Language
vro DVD Recorder File
vrt x-world/x-vrt
vsd Visio Drawing
vss Visio Stencil
vst Visio Template
vst Photoshop Elements
vtp VT420 profile (Rumba VT420 (SPRY Telnet) session profile
vts workbook/formulaone Forumle One - A Java Spread sheet and report generator from Tidestone
vxd Virtual Device Driver
W ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z
wab Windows (Outlook) Address Book
waf plugin/wanimate Mayim's WAF Compiler file for interactive 3D with Walkabout browser plug-in
waf MS IE Web Archiv (on Mac)
wan plugin/wanimate
wav audio/x-wav, audio/wav Windows Audio File WAVE format
wax audio/x-ms-wax Windows Media Audio Redirector to WMA file.
wb white board
wb2 QuatroPro
wbmp image/vnd.wap.wbmp Wireless Bitmap File Format - Mobil phones
webm Compressed video file created using the WebM format, an open, high-quality video standard; stores video compressed using VP8 technology.
wi image/wavelet
wid application/x-DemoShield Width table (Ventura Publisher)
wis application/x-InstallShield
wk1 Lotus 1-2-3 Worksheets
wks application/x-msworks MS Works or Lotus 1-2-3 Worksheets
wkz for Wingz spreadsheet from Informics
wlt application/x-mswallet eWallet file
wm video/x-ms-wm
wma audio/x-ms-wma Windows Media Audio. Stored in ASF.
wme Windows Media Encoder Session Profile
wmf image/x-wmf Windows MetaFile vector graphics
wmf image/x-msmetafile Windows MetaFile (metafile)
wml text/vnd.wap.wml Wireless Markup Language File
wml text/wml Website META Language File
wmv video/x-ms-wmv Windows Media Video (Stored in ASF format). Use Windows Media Player on Windows and Flip4Mac WMV to play wich QuickTime on a Mac.
woff application/font-woff Web Open Font Format File
wp application/wordperfect WordPerfect
wpc application/wpc Text-format converters used 1990-1997 by MS Word and Write
wpc application/pcms_wp WordPerfect Character Mapping File
wpd,
wp5 application/wordperfect5.1, application/wordperfect6, application/wordperfect8 Document (WordPerfect)
wpf WordPerfect (variation is .WP)
wpg WordPerfect Graphics (metafile)
wps application/vnd.ms-works
application/x-msworks-wp MS Works
wpt Magellan GPS WayPoint (POI) file
wri application/x-mswrite Write format (MS Windows)
wrl Cosmo Player VRML Worlds
wrl model/vrml, x-world/x-vrml Plain Text VRML File
wrz x-world/x-vrml
wsd WordStar
wtx audio/x-wtx, audio/wtx
wvx video/x-ms-wvx
X-Z ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z
File Extn MIME Type Start
with Descr
xbm image/x-xbitmap X Bitmaps
xdr video/x-videogram
xla application/vnd.ms-excel MS Excel (Add in)
xlam application/vnd.ms-excel.
addin.macroEnabled.12 MS Excel 2007 add-In
xlc application/vnd.ms-excel MS Excel (Chart)
xlm application/vnd.ms-excel MS Excel Macro
xlr MS Works
xls application/vnd.ms-excel \xD0CF
11E0A1 MS Excel
xlsm application/vnd.ms-excel.
sheet.macroEnabled.12 MS Excel 2007 XML macro-enabled Workbook
xlsx application/vnd.openxmlformats-
officedocument.spreadsheetml.sheet \X50 4B 03 04 MS Excel 2007 XML Workbook
xltx application/vnd.openxmlformats-
officedocument.spreadsheetml.template MS Excel 2007 XML Template
xlt application/vnd.ms-excel MS Excel (template)
xlw application/vnd.ms-excel MS Excel (workbook)
xm sound
xml text/xml Extensible Markup Language
xpi application/x-xpinstall Mozilla/Firefox Extension Archive
xpm image/x-xpixmap X Pixmap format
xsb application/x-xsb Superbook
xsl Extensible Style Language
xtd XML Type Definition
xul application/vnd.mozilla.xul+xml
text/xul XML User Interface Language
xwd image/x-xwindowdump X Window Dump (xwd)
xyz chemical/x-pdb ASCII RPG Maker Graphic Format
xy XyWrite
Y
y Amiga Yabba Compressed Archive
yuv Color Space Pixel Format - (CCIR 601 4:1:1) Bitmap image
Z
z application/x-compress, application/x-compressed Compressed file ASCII archive created by COMPRESS
or Gzip
Z application/x-compress, application/x-compressed, application/gzip UNIX Compressed Archive File
zdl application/x-zip-compressed, application/zip, application/x-compressed PKZIP
zip DesignPro Label Design, e.g Bus Cards, display sftwr at avery.com
zoo compressed Zoo archive
zpa application/pcphoto
zw Chinese
End ->A | B | C | D | E-F | G-H | I | J-L | M | N-O | P | Q-R | S | T-U | V | W | X-Z
Start With - Identifying characters at the beginning of the file. \x = Hex Char.

Notes:

If the extension is of the form .??_ the file is likely a compressed file and part of an install routine. When the install program runs it will expand the file and replace the underscore with the proper letter for the file type.

If the file is sent as an audio file with any three-character extension it may be a dictation file where the extension is the dictator's initials; playable by BCB Voice Systems software (see ??? extension). The file could likewise be a dictation file inTrueSpeech format. Use Windows Sound Recorder and/or Media Player to play these back.

Above links go to www.fileinfo.com

File Type from Content:
What if a file has no extension. Some files start with identifying characters "start with" field in table above. e.g. GIF for a .gif and BOBO for Claris Works (.cwk).
Use a program such as TextPad or EditPadPro on Windows or TextEdit on a Mac to open files. The first few characters are listed under "start with" above.
TrID will look up the first few characters in a database to determine the creator.
See FAQ at filext.com
First Char. Extension Type
BM .BMP bitmap image.
GIF .GIF GIF image.
PK .ZIP archive file.
MZ .EXE executable file.
%PDF .PDF Adobe PDF file.
Win Mac Hex
ÐÏ —œ D0 CF .doc, .xls Microsoft Word, Excel
FF D8 FF E0 .jpg JEPG
ÿWPC ÿWPC FF WPC Word Perfect

Other MIME types
Can't find file name extension for the following:
audio/tone audio/tone-info+xml audio/telephone-event
Sources:
FileInfo.com lists programs which will open a file when you click on the extension.
fileSuffix.com (has mime types)
filext.com The File Extension Source (Lists Identifying characters at the beginning of the file)
dotWhat.net - The net's #1 file extension website
fileFormat.info
www.webopedia.com/quick_ref/fileextensionsfull.asp
FileInfo.net lists programs which will open a file when you click on the extension.
File Extension Seeker - Metasearch engine for file extensions
windows.com/fileassoc/
Marco Pontello's list
#See HKEY_CLASSES_ROOT in regedit on Windows NT

MIME types at MIME information here.
MIME Media Types at the Internet Assigned Numbers Authority (IANA)
www.indiana.edu/cgi-bin-local/mimetypes
Mime-Type to extension list at www.fraw.org.uk/fraw_admin/mime_types.txt
www.yolinux.com/TUTORIALS/LinuxTutorialMimeTypesAndApplications.html

See Also:
Wireless (mobil SMS, ...) file types
Audio file types
Image file types
Video file types
Audio Video
Compressed/encrypted - ZIP, TAR, gzip, UUEncode, XXencode, BinHex, and MIME. ARJ, LZH, and ARC
Example files - sample test files
Extension at SearchSMB.com
Windows XP file Extensions
File Extensions List at UK Technical Support
Dave McRitchie's list
Assiociate This! - Software to manage file / application associations
Graphical image formats at IC DataMaster
URL's
File Extensions, Formats and Utilities at Stack Tech. Svcs.
Mappings from filename suffixes to MIME types

File Systems FAT, NTFS, HFS, UFS, ...
Examples and test files

Terms # Vector - Graphics format where objects are defined based on their shape and location. # Raster - Bit Map graphics format where the drawing is just a collection of pixels (bitmap) # Metafile - Graphics format which is a combination of Raster and Vector

last updated 9 Aug 2014