什么是 MIME TYPE?
一、首先,我们要了解浏览器是如何处理内容的。在浏览器中显示的内容有 HTML、有 XML、有 GIF、还有 Flash ……那么,浏览器是如何区分它们,决定什么内容用什么形式来显示呢?答案是 MIME Type,也就是该资源的媒体类型。
媒体类型通常是通过 HTTP 协议,由 Web 服务器告知浏览器的,更准确地说,是通过 Content-Type 来表示的,例如:
Content-Type: text/HTML
表示内容是 text/HTML 类型,也就是超文本文件。为什么是“text/HTML”而不是“HTML/text”或者别的什么?MIME Type 不是个人指定的,是经过 ietf 组织协商,以 RFC 的形式作为建议的标准发布在网上的,大多数的 Web 服务器和用户代理都会支持这个规范 (顺便说一句,Email 附件的类型也是通过 MIME Type 指定的)。
通常只有一些在互联网上获得广泛应用的格式才会获得一个 MIME Type,如果是某个客户端自己定义的格式,一般只能以 application/x- 开头。
XHTML 正是一个获得广泛应用的格式,因此,在 RFC 3236 中,说明了 XHTML 格式文件的 MIME Type 应该是 application/xHTML+XML。
当然,处理本地的文件,在没有人告诉浏览器某个文件的 MIME Type 的情况下,浏览器也会做一些默认的处理,这可能和你在操作系统中给文件配置的 MIME Type 有关。比如在 Windows 下,打开注册表的“HKEY_LOCAL_MACHINESOFTWAREClassesMIMEDatabaseContent Type”主键,你可以看到所有 MIME Type 的配置信息。
二、在把输出结果传送到浏览器上的时候,浏览器必须启动适当的应用程序来处理这个输出文档。这可以通过多种类型MIME(多功能网际邮件扩充协议)来完成。在HTTP中,MIME类型被定义在Content-Type header中。
例如,架设你要传送一个Microsoft Excel文件到客户端。那么这时的MIME类型就是“application/vnd.ms-excel”。在大多数实际情况中,这个文件然后将传送给Execl来处理(假设我们设定Execl为处理特殊MIME类型的应用程序)。在ASP中,设定MIME类型的方法是通过Response对象的ContentType属性。
多媒体文件格式MIME
最早的HTTP协议中,并没有附加的数据类型信息,所有传送的数据都被客户程序解释为超文本标记语言HTML 文档,而为了支持多媒体数据类型,HTTP协议中就使用了附加在文档之前的MIME数据类型信息来标识数据类型。
MIME意为多目Internet邮件扩展,它设计的最初目的是为了在发送电子邮件时附加多媒体数据,让邮件客户程序能根据其类型进行处理。然而当它被HTTP协议支持之后,它的意义就更为显著了。它使得HTTP传输的不仅是普通的文本,而变得丰富多彩。
每个MIME类型由两部分组成,前面是数据的大类别,例如声音audio、图象image等,后面定义具体的种类。
常见的MIME类型
超文本标记语言文本 .html,.html text/html
普通文本 .txt text/plain
RTF文本 .rtf application/rtf
GIF图形 .gif image/gif
JPEG图形 .ipeg,.jpg image/jpeg
au声音文件 .au audio/basic
MIDI音乐文件 mid,.midi audio/midi,audio/x-midi
RealAudio音乐文件 .ra, .ram audio/x-pn-realaudio
MPEG文件 .mpg,.mpeg video/mpeg
AVI文件 .avi video/x-msvideo
GZIP文件 .gz application/x-gzip
TAR文件 .tar application/x-tar
Internet中有一个专门组织IANA来确认标准的MIME类型,但Internet发展的太快,很多应用程序等不及IANA来确认他们使用的MIME类型为标准类型。因此他们使用在类别中以x-开头的方法标识这个类别还没有成为标准,例如:x-gzip,x-tar等。事实上这些类型运用的很广泛,已经成为了事实标准。只要客户机和服务器共同承认这个MIME类型,即使它是不标准的类型也没有关系,客户程序就能根据MIME类型,采用具体的处理手段来处理数据。而Web服务器和浏览器(包括操作系统)中,缺省都设置了标准的和常见的MIME类型,只有对于不常见的 MIME类型,才需要同时设置服务器和客户浏览器,以进行识别。
由于MIME类型与文档的后缀相关,因此服务器使用文档的后缀来区分不同文件的MIME类型,服务器中必须定义文档后缀和MIME类型之间的对应关系。而客户程序从服务器上接收数据的时候,它只是从服务器接受数据流,并不了解文档的名字,因此服务器必须使用附加信息来告诉客户程序数据的MIME类型。服务器在发送真正的数据之前,就要先发送标志数据的MIME类型的信息,这个信息使用Content-type关键字进行定义,例如对于HTML文档,服务器将首先发送以下两行MIME标识信息,这个标识并不是真正的数据文件的一部分。
Content-type: text/html
注意,第二行为一个空行,这是必须的,使用这个空行的目的是将MIME信息与真正的数据内容分隔开。
MIME (Multipurpose Internet Mail Extensions) 是描述消息内容类型的因特网标准。
MIME 消息能包含文本、图像、音频、视频以及其他应用程序专用的数据。
官方的 MIME 信息是由 Internet Engineering Task Force (IETF) 在下面的文档中提供的:
RFC-822 Standard for ARPA Internet text messages
RFC-2045 MIME Part 1: Format of Internet Message Bodies
RFC-2046 MIME Part 2: Media Types
RFC-2047 MIME Part 3: Header Extensions for Non-ASCII Text
RFC-2048 MIME Part 4: Registration Procedures
RFC-2049 MIME Part 5: Conformance Criteria and Examples
不同的应用程序支持不同的 MIME 类型。
Suffixes applicable |
Media type and subtype(s) |
.3dm
x-world/x-3dmf
.3dmf
x-world/x-3dmf
.a
application/octet-stream
.aab
application/x-authorware-bin
.aam
application/x-authorware-map
.aas
application/x-authorware-seg
.abc
text/vnd.abc
.acgi
text/html
.afl
video/animaflex
.ai
application/postscript
.aif
audio/aiff
.aif
audio/x-aiff
.aifc
audio/aiff
.aifc
audio/x-aiff
.aiff
audio/aiff
.aiff
audio/x-aiff
.aim
application/x-aim
.aip
text/x-audiosoft-intra
.ani
application/x-navi-animation
.aos
application/x-nokia-9000-communicator-add-on-software
.aps
application/mime
.arc
application/octet-stream
.arj
application/arj
.arj
application/octet-stream
.art
image/x-jg
.asf
video/x-ms-asf
.asm
text/x-asm
.asp
text/asp
.asx
application/x-mplayer2
.asx
video/x-ms-asf
.asx
video/x-ms-asf-plugin
.au
audio/basic
.au
audio/x-au
.avi
application/x-troff-msvideo
.avi
video/avi
.avi
video/msvideo
.avi
video/x-msvideo
.avs
video/avs-video
.bcpio
application/x-bcpio
.bin
application/mac-binary
.bin
application/macbinary
.bin
application/octet-stream
.bin
application/x-binary
.bin
application/x-macbinary
.bm
image/bmp
.bmp
image/bmp
.bmp
image/x-windows-bmp
.boo
application/book
.book
application/book
.boz
application/x-bzip2
.bsh
application/x-bsh
.bz
application/x-bzip
.bz2
application/x-bzip2
.c
text/plain
.c
text/x-c
.c++
text/plain
.cat
application/vnd.ms-pki.seccat
.cc
text/plain
.cc
text/x-c
.ccad
application/clariscad
.cco
application/x-cocoa
.cdf
application/cdf
.cdf
application/x-cdf
.cdf
application/x-netcdf
.cer
application/pkix-cert
.cer
application/x-x509-ca-cert
.cha
application/x-chat
.chat
application/x-chat
.class
application/java
.class
application/java-byte-code
.class
application/x-java-class
.com
application/octet-stream
.com
text/plain
.conf
text/plain
.cpio
application/x-cpio
.cpp
text/x-c
.cpt
application/mac-compactpro
.cpt
application/x-compactpro
.cpt
application/x-cpt
.crl
application/pkcs-crl
.crl
application/pkix-crl
.crt
application/pkix-cert
.crt
application/x-x509-ca-cert
.crt
application/x-x509-user-cert
.csh
application/x-csh
.csh
text/x-script.csh
.css
application/x-pointplus
.css
text/css
.cxx
text/plain
.dcr
application/x-director
.deepv
application/x-deepv
.def
text/plain
.der
application/x-x509-ca-cert
.dif
video/x-dv
.dir
application/x-director
.dl
video/dl
.dl
video/x-dl
.doc
application/msword
.dot
application/msword
.dp
application/commonground
.drw
application/drafting
.dump
application/octet-stream
.dv
video/x-dv
.dvi
application/x-dvi
.dwf
drawing/x-dwf (old)
.dwf
model/vnd.dwf
.dwg
application/acad
.dwg
image/vnd.dwg
.dwg
image/x-dwg
.dxf
application/dxf
.dxf
image/vnd.dwg
.dxf
image/x-dwg
.dxr
application/x-director
.el
text/x-script.elisp
.elc
application/x-bytecode.elisp (compiled elisp)
.elc
application/x-elc
.env
application/x-envoy
.eps
application/postscript
.es
application/x-esrehber
.etx
text/x-setext
.evy
application/envoy
.evy
application/x-envoy
.exe
application/octet-stream
.f
text/plain
.f
text/x-fortran
.f77
text/x-fortran
.f90
text/plain
.f90
text/x-fortran
.fdf
application/vnd.fdf
.fif
application/fractals
.fif
image/fif
.fli
video/fli
.fli
video/x-fli
.flo
image/florian
.flx
text/vnd.fmi.flexstor
.fmf
video/x-atomic3d-feature
.for
text/plain
.for
text/x-fortran
.fpx
image/vnd.fpx
.fpx
image/vnd.net-fpx
.frl
application/freeloader
.funk
audio/make
.g
text/plain
.g3
image/g3fax
.gif
image/gif
.gl
video/gl
.gl
video/x-gl
.gsd
audio/x-gsm
.gsm
audio/x-gsm
.gsp
application/x-gsp
.gss
application/x-gss
.gtar
application/x-gtar
.gz
application/x-compressed
.gz
application/x-gzip
.gzip
application/x-gzip
.gzip
multipart/x-gzip
.h
text/plain
.h
text/x-h
.hdf
application/x-hdf
.help
application/x-helpfile
.hgl
application/vnd.hp-hpgl
.hh
text/plain
.hh
text/x-h
.hlb
text/x-script
.hlp
application/hlp
.hlp
application/x-helpfile
.hlp
application/x-winhelp
.hpg
application/vnd.hp-hpgl
.hpgl
application/vnd.hp-hpgl
.hqx
application/binhex
.hqx
application/binhex4
.hqx
application/mac-binhex
.hqx
application/mac-binhex40
.hqx
application/x-binhex40
.hqx
application/x-mac-binhex40
.hta
application/hta
.htc
text/x-component
.htm
text/html
.html
text/html
.htmls
text/html
.htt
text/webviewhtml
.htx
text/html
.ice
x-conference/x-cooltalk
.ico
image/x-icon
.idc
text/plain
.ief
image/ief
.iefs
image/ief
.iges
application/iges
.iges
model/iges
.igs
application/iges
.igs
model/iges
.ima
application/x-ima
.imap
application/x-httpd-imap
.inf
application/inf
.ins
application/x-internett-signup
.ip
application/x-ip2
.isu
video/x-isvideo
.it
audio/it
.iv
application/x-inventor
.ivr
i-world/i-vrml
.ivy
application/x-livescreen
.jam
audio/x-jam
.jav
text/plain
.jav
text/x-java-source
.java
text/plain
.java
text/x-java-source
.jcm
application/x-java-commerce
.jfif
image/jpeg
.jfif
image/pjpeg
.jfif-tbnl
image/jpeg
.jpe
image/jpeg
.jpe
image/pjpeg
.jpeg
image/jpeg
.jpeg
image/pjpeg
.jpg
image/jpeg
.jpg
image/pjpeg
.jps
image/x-jps
.js
application/x-javascript
.js
application/javascript
.js
application/ecmascript
.js
text/javascript
.js
text/ecmascript
.jut
image/jutvision
.kar
audio/midi
.kar
music/x-karaoke
.ksh
application/x-ksh
.ksh
text/x-script.ksh
.la
audio/nspaudio
.la
audio/x-nspaudio
.lam
audio/x-liveaudio
.latex
application/x-latex
.lha
application/lha
.lha
application/octet-stream
.lha
application/x-lha
.lhx
application/octet-stream
.list
text/plain
.lma
audio/nspaudio
.lma
audio/x-nspaudio
.log
text/plain
.lsp
application/x-lisp
.lsp
text/x-script.lisp
.lst
text/plain
.lsx
text/x-la-asf
.ltx
application/x-latex
.lzh
application/octet-stream
.lzh
application/x-lzh
.lzx
application/lzx
.lzx
application/octet-stream
.lzx
application/x-lzx
.m
text/plain
.m
text/x-m
.m1v
video/mpeg
.m2a
audio/mpeg
.m2v
video/mpeg
.m3u
audio/x-mpequrl
.man
application/x-troff-man
.map
application/x-navimap
.mar
text/plain
.mbd
application/mbedlet
.mc$
application/x-magic-cap-package-1.0
.mcd
application/mcad
.mcd
application/x-mathcad
.mcf
image/vasa
.mcf
text/mcf
.mcp
application/netmc
.me
application/x-troff-me
.mht
message/rfc822
.mhtml
message/rfc822
.mid
application/x-midi
.mid
audio/midi
.mid
audio/x-mid
.mid
audio/x-midi
.mid
music/crescendo
.mid
x-music/x-midi
.midi
application/x-midi
.midi
audio/midi
.midi
audio/x-mid
.midi
audio/x-midi
.midi
music/crescendo
.midi
x-music/x-midi
.mif
application/x-frame
.mif
application/x-mif
.mime
message/rfc822
.mime
www/mime
.mjf
audio/x-vnd.audioexplosion.mjuicemediafile
.mjpg
video/x-motion-jpeg
.mm
application/base64
.mm
application/x-meme
.mme
application/base64
.mod
audio/mod
.mod
audio/x-mod
.moov
video/quicktime
.mov
video/quicktime
.movie
video/x-sgi-movie
.mp2
audio/mpeg
.mp2
audio/x-mpeg
.mp2
video/mpeg
.mp2
video/x-mpeg
.mp2
video/x-mpeq2a
.mp3
audio/mpeg3
.mp3
audio/x-mpeg-3
.mp3
video/mpeg
.mp3
video/x-mpeg
.mpa
audio/mpeg
.mpa
video/mpeg
.mpc
application/x-project
.mpe
video/mpeg
.mpeg
video/mpeg
.mpg
audio/mpeg
.mpg
video/mpeg
.mpga
audio/mpeg
.mpp
application/vnd.ms-project
.mpt
application/x-project
.mpv
application/x-project
.mpx
application/x-project
.mrc
application/marc
.ms
application/x-troff-ms
.mv
video/x-sgi-movie
.my
audio/make
.mzz
application/x-vnd.audioexplosion.mzz
.nap
image/naplps
.naplps
image/naplps
.nc
application/x-netcdf
.ncm
application/vnd.nokia.configuration-message
.nif
image/x-niff
.niff
image/x-niff
.nix
application/x-mix-transfer
.nsc
application/x-conference
.nvd
application/x-navidoc
.o
application/octet-stream
.oda
application/oda
.omc
application/x-omc
.omcd
application/x-omcdatamaker
.omcr
application/x-omcregerator
.p
text/x-pascal
.p10
application/pkcs10
.p10
application/x-pkcs10
.p12
application/pkcs-12
.p12
application/x-pkcs12
.p7a
application/x-pkcs7-signature
.p7c
application/pkcs7-mime
.p7c
application/x-pkcs7-mime
.p7m
application/pkcs7-mime
.p7m
application/x-pkcs7-mime
.p7r
application/x-pkcs7-certreqresp
.p7s
application/pkcs7-signature
.part
application/pro_eng
.pas
text/pascal
.pbm
image/x-portable-bitmap
.pcl
application/vnd.hp-pcl
.pcl
application/x-pcl
.pct
image/x-pict
.pcx
image/x-pcx
.pdb
chemical/x-pdb
.pdf
application/pdf
.pfunk
audio/make
.pfunk
audio/make.my.funk
.pgm
image/x-portable-graymap
.pgm
image/x-portable-greymap
.pic
image/pict
.pict
image/pict
.pkg
application/x-newton-compatible-pkg
.pko
application/vnd.ms-pki.pko
.pl
text/plain
.pl
text/x-script.perl
.plx
application/x-pixclscript
.pm
image/x-xpixmap
.pm
text/x-script.perl-module
.pm4
application/x-pagemaker
.pm5
application/x-pagemaker
.png
image/png
.pnm
application/x-portable-anymap
.pnm
image/x-portable-anymap
.pot
application/mspowerpoint
.pot
application/vnd.ms-powerpoint
.pov
model/x-pov
.ppa
application/vnd.ms-powerpoint
.ppm
image/x-portable-pixmap
.pps
application/mspowerpoint
.pps
application/vnd.ms-powerpoint
.ppt
application/mspowerpoint
.ppt
application/powerpoint
.ppt
application/vnd.ms-powerpoint
.ppt
application/x-mspowerpoint
.ppz
application/mspowerpoint
.pre
application/x-freelance
.prt
application/pro_eng
.ps
application/postscript
.psd
application/octet-stream
.pvu
paleovu/x-pv
.pwz
application/vnd.ms-powerpoint
.py
text/x-script.phyton
.pyc
application/x-bytecode.python
.qcp
audio/vnd.qcelp
.qd3
x-world/x-3dmf
.qd3d
x-world/x-3dmf
.qif
image/x-quicktime
.qt
video/quicktime
.qtc
video/x-qtc
.qti
image/x-quicktime
.qtif
image/x-quicktime
.ra
audio/x-pn-realaudio
.ra
audio/x-pn-realaudio-plugin
.ra
audio/x-realaudio
.ram
audio/x-pn-realaudio
.ras
application/x-cmu-raster
.ras
image/cmu-raster
.ras
image/x-cmu-raster
.rast
image/cmu-raster
.rexx
text/x-script.rexx
.rf
image/vnd.rn-realflash
.rgb
image/x-rgb
.rm
application/vnd.rn-realmedia
.rm
audio/x-pn-realaudio
.rmi
audio/mid
.rmm
audio/x-pn-realaudio
.rmp
audio/x-pn-realaudio
.rmp
audio/x-pn-realaudio-plugin
.rng
application/ringing-tones
.rng
application/vnd.nokia.ringing-tone
.rnx
application/vnd.rn-realplayer
.roff
application/x-troff
.rp
image/vnd.rn-realpix
.rpm
audio/x-pn-realaudio-plugin
.rt
text/richtext
.rt
text/vnd.rn-realtext
.rtf
application/rtf
.rtf
application/x-rtf
.rtf
text/richtext
.rtx
application/rtf
.rtx
text/richtext
.rv
video/vnd.rn-realvideo
.s
text/x-asm
.s3m
audio/s3m
.saveme
application/octet-stream
.sbk
application/x-tbook
.scm
application/x-lotusscreencam
.scm
text/x-script.guile
.scm
text/x-script.scheme
.scm
video/x-scm
.sdml
text/plain
.sdp
application/sdp
.sdp
application/x-sdp
.sdr
application/sounder
.sea
application/sea
.sea
application/x-sea
.set
application/set
.sgm
text/sgml
.sgm
text/x-sgml
.sgml
text/sgml
.sgml
text/x-sgml
.sh
application/x-bsh
.sh
application/x-sh
.sh
application/x-shar
.sh
text/x-script.sh
.shar
application/x-bsh
.shar
application/x-shar
.shtml
text/html
.shtml
text/x-server-parsed-html
.sid
audio/x-psid
.sit
application/x-sit
.sit
application/x-stuffit
.skd
application/x-koan
.skm
application/x-koan
.skp
application/x-koan
.skt
application/x-koan
.sl
application/x-seelogo
.smi
application/smil
.smil
application/smil
.snd
audio/basic
.snd
audio/x-adpcm
.sol
application/solids
.spc
application/x-pkcs7-certificates
.spc
text/x-speech
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application/futuresplash
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application/x-sprite
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application/x-sprite
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application/x-wais-source
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text/x-server-parsed-html
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application/streamingmedia
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application/vnd.ms-pki.certstore
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application/step
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application/sla
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application/vnd.ms-pki.stl
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application/x-navistyle
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application/step
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application/x-sv4cpio
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application/x-sv4crc
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image/vnd.dwg
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image/x-dwg
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application/x-world
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x-world/x-svr
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application/x-shockwave-flash
.t
application/x-troff
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text/x-speech
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application/x-tar
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application/toolbook
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application/x-tbook
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application/x-tcl
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text/x-script.tcl
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text/x-script.tcsh
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application/x-tex
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application/x-texinfo
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application/x-texinfo
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application/plain
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text/plain
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application/gnutar
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application/x-compressed
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image/tiff
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image/x-tiff
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image/tiff
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image/x-tiff
.tr
application/x-troff
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audio/tsp-audio
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application/dsptype
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audio/tsplayer
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text/tab-separated-values
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image/florian
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text/plain
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text/x-uil
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text/uri-list
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text/uri-list
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application/i-deas
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text/uri-list
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text/uri-list
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application/x-ustar
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multipart/x-ustar
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application/octet-stream
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text/x-uuencode
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application/x-cdlink
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text/x-vcalendar
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application/vda
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video/vdo
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application/groupwise
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video/vivo
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video/vnd.vivo
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video/vivo
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video/vnd.vivo
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application/vocaltec-media-desc
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application/vocaltec-media-file
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audio/voc
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audio/x-voc
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video/vosaic
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audio/voxware
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audio/x-twinvq-plugin
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audio/x-twinvq
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audio/x-twinvq-plugin
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application/x-vrml
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model/vrml
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x-world/x-vrml
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x-world/x-vrt
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application/x-visio
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application/x-visio
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application/x-visio
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application/wordperfect6.0
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application/wordperfect6.1
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application/msword
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audio/wav
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audio/x-wav
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application/x-qpro
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image/vnd.wap.wbmp
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application/vnd.xara
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application/msword
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application/x-123
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windows/metafile
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text/vnd.wap.wml
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application/vnd.wap.wmlc
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application/vnd.wap.wmlscriptc
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application/msword
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application/wordperfect
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application/wordperfect
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application/wordperfect6.0
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application/wordperfect
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application/wordperfect
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application/x-wpwin
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application/x-lotus
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application/mswrite
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application/x-wri
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application/x-world
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model/vrml
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x-world/x-vrml
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model/vrml
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x-world/x-vrml
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text/scriplet
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application/x-wais-source
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application/x-wintalk
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image/x-xbitmap
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image/x-xbm
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image/xbm
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video/x-amt-demorun
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xgl/drawing
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application/excel
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application/x-excel
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application/x-msexcel
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application/x-excel
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application/vnd.ms-excel
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application/x-excel
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application/excel
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application/vnd.ms-excel
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application/x-excel
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application/excel
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application/x-excel
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application/excel
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application/x-excel
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application/excel
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application/vnd.ms-excel
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application/x-excel
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application/x-msexcel
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audio/xm
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application/xml
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text/xml
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xgl/movie
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application/x-vnd.ls-xpix
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image/x-xpixmap
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image/xpm
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image/png
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video/x-amt-showrun
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image/x-xwd
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image/x-xwindowdump
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chemical/x-pdb
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application/x-compress
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application/x-compressed
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application/x-compressed
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application/x-zip-compressed
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application/zip
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multipart/x-zip
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application/octet-stream
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text/x-script.zsh