來個直白的：

return array(
    '3dml'=>'text/vnd.in3d.3dml',
    '3ds'=>'image/x-3ds',
    '3g2'=>'video/3gpp2',
    '3gp'
 
=>'video/3gpp',
    '7z'=>'application/x-7z-compressed',
    'aab'=>'application/x-authorware-bin',
    'aac'=>'audio/x-aac',
    'aam'=>'application/x-authorware-map',
    'aas'=>'application/x-authorware-seg',
    'abw'=>'application/x-abiword',
    'ac'=>'application/pkix-attr-cert'
 
,
    'acc'=>'application/vnd.americandynamics.acc',
    'ace'=>'application/x-ace-compressed',
    'acu'=>'application/vnd.acucobol',
    'acutc'=>'application/vnd.acucorp',
    'adp'=>'audio/adpcm',
    'aep'=>'application/vnd.audiograph',
    'afm'=>'application/x-font-type1',
    'afp'=>'application/vnd.ibm.modcap',
    'ahead'=>'application/vnd.ahead.space',
    'ai'=>'application/postscript',
    'aif'=>'audio/x-aiff',
    'aifc'=>'audio/x-aiff',
    'aiff'=>'audio/x-aiff',
    'air'=>'application/vnd.adobe.air-application-installer-package+zip',
    'ait'=>'application/vnd.dvb.ait',
    'ami'=>'application/vnd.amiga.ami',
    'apk'=>'application/vnd.android.package-archive',
    'appcache'=>'text/cache-manifest',
    'application'=>'application/x-ms-application',
    'apr'=>'application/vnd.lotus-approach',
    'arc'=>'application/x-freearc',
    'asc'=>'application/pgp-signature',
    'asf'=>'video/x-ms-asf',
    'asm'=>'text/x-asm',
    'aso'=>'application/vnd.accpac.simply.aso',
    'asx'=>'video/x-ms-asf',
    'atc'=>'application/vnd.acucorp',
    'atom'=>'application/atom+xml',
    'atomcat'=>'application/atomcat+xml',
    'atomsvc'=>'application/atomsvc+xml',
    'atx'=>'application/vnd.antix.game-component',
    'au'=>'audio/basic',
    'avi'=>'video/x-msvideo',
    'aw'=>'application/applixware',
    'azf'=>'application/vnd.airzip.filesecure.azf',
    'azs'=>'application/vnd.airzip.filesecure.azs',
    'azw'=>'application/vnd.amazon.ebook',
    'bat'=>'application/x-msdownload',
    'bcpio'=>'application/x-bcpio',
    'bdf'=>'application/x-font-bdf',
    'bdm'=>'application/vnd.syncml.dm+wbxml',
    'bed'=>'application/vnd.realvnc.bed',
    'bh2'=>'application/vnd.fujitsu.oasysprs',
    'bin'=>'application/octet-stream',
    'blb'=>'application/x-blorb',
    'blorb'=>'application/x-blorb',
    'bmi'=>'application/vnd.bmi',
    'bmp'=>'image/bmp',
    'book'=>'application/vnd.framemaker',
    'box'=>'application/vnd.previewsystems.box',
    'boz'=>'application/x-bzip2',
    'bpk'=>'application/octet-stream',
    'btif'=>'image/prs.btif',
    'bz'=>'application/x-bzip',
    'bz2'=>'application/x-bzip2',
    'c'=>'text/x-c',
    'c11amc'=>'application/vnd.cluetrust.cartomobile-config',
    'c11amz'=>'application/vnd.cluetrust.cartomobile-config-pkg',
    'c4d'=>'application/vnd.clonk.c4group',
    'c4f'=>'application/vnd.clonk.c4group',
    'c4g'=>'application/vnd.clonk.c4group',
    'c4p'=>'application/vnd.clonk.c4group',
    'c4u'=>'application/vnd.clonk.c4group',
    'cab'=>'application/vnd.ms-cab-compressed',
    'caf'=>'audio/x-caf',
    'cap'=>'application/vnd.tcpdump.pcap',
    'car'=>'application/vnd.curl.car',
    'cat'=>'application/vnd.ms-pki.seccat',
    'cb7'=>'application/x-cbr',
    'cba'=>'application/x-cbr',
    'cbr'=>'application/x-cbr',
    'cbt'=>'application/x-cbr',
    'cbz'=>'application/x-cbr',
    'cc'=>'text/x-c',
    'cct'=>'application/x-director',
    'ccxml'=>'application/ccxml+xml',
    'cdbcmsg'=>'application/vnd.contact.cmsg',
    'cdf'=>'application/x-netcdf',
    'cdkey'=>'application/vnd.mediastation.cdkey',
    'cdmia'=>'application/cdmi-capability',
    'cdmic'=>'application/cdmi-container',
    'cdmid'=>'application/cdmi-domain',
    'cdmio'=>'application/cdmi-object',
    'cdmiq'=>'application/cdmi-queue',
    'cdx'=>'chemical/x-cdx',
    'cdxml'=>'application/vnd.chemdraw+xml',
    'cdy'=>'application/vnd.cinderella',
    'cer'=>'application/pkix-cert',
    'cfs'=>'application/x-cfs-compressed',
    'cgm'=>'image/cgm',
    'chat'=>'application/x-chat',
    'chm'=>'application/vnd.ms-htmlhelp',
    'chrt'=>'application/vnd.kde.kchart',
    'cif'=>'chemical/x-cif',
    'cii'=>'application/vnd.anser-web-certificate-issue-initiation',
    'cil'=>'application/vnd.ms-artgalry',
    'cla'=>'application/vnd.claymore',
    'class'=>'application/java-vm',
    'clkk'=>'application/vnd.crick.clicker.keyboard',
    'clkp'=>'application/vnd.crick.clicker.palette',
    'clkt'=>'application/vnd.crick.clicker.template',
    'clkw'=>'application/vnd.crick.clicker.wordbank',
    'clkx'=>'application/vnd.crick.clicker',
    'clp'=>'application/x-msclip',
    'cmc'=>'application/vnd.cosmocaller',
    'cmdf'=>'chemical/x-cmdf',
    'cml'=>'chemical/x-cml',
    'cmp'=>'application/vnd.yellowriver-custom-menu',
    'cmx'=>'image/x-cmx',
    'cod'=>'application/vnd.rim.cod',
    'com'=>'application/x-msdownload',
    'conf'=>'text/plain',
    'cpio'=>'application/x-cpio',
    'cpp'=>'text/x-c',
    'cpt'=>'application/mac-compactpro',
    'crd'=>'application/x-mscardfile',
    'crl'=>'application/pkix-crl',
    'crt'=>'application/x-x509-ca-cert',
    'cryptonote'=>'application/vnd.rig.cryptonote',
    'csh'=>'application/x-csh',
    'csml'=>'chemical/x-csml',
    'csp'=>'application/vnd.commonspace',
    'css'=>'text/css',
    'cst'=>'application/x-director',
    'csv'=>'text/csv',
    'cu'=>'application/cu-seeme',
    'curl'=>'text/vnd.curl',
    'cww'=>'application/prs.cww',
    'cxt'=>'application/x-director',
    'cxx'=>'text/x-c',
    'dae'=>'model/vnd.collada+xml',
    'daf'=>'application/vnd.mobius.daf',
    'dart'=>'application/vnd.dart',
    'dataless'=>'application/vnd.fdsn.seed',
    'davmount'=>'application/davmount+xml',
    'dbk'=>'application/docbook+xml',
    'dcr'=>'application/x-director',
    'dcurl'=>'text/vnd.curl.dcurl',
    'dd2'=>'application/vnd.oma.dd2+xml',
    'ddd'=>'application/vnd.fujixerox.ddd',
    'deb'=>'application/x-debian-package',
    'def'=>'text/plain',
    'deploy'=>'application/octet-stream',
    'der'=>'application/x-x509-ca-cert',
    'dfac'=>'application/vnd.dreamfactory',
    'dgc'=>'application/x-dgc-compressed',
    'dic'=>'text/x-c',
    'dir'=>'application/x-director',
    'dis'=>'application/vnd.mobius.dis',
    'dist'=>'application/octet-stream',
    'distz'=>'application/octet-stream',
    'djv'=>'image/vnd.djvu',
    'djvu'=>'image/vnd.djvu',
    'dll'=>'application/x-msdownload',
    'dmg'=>'application/x-apple-diskimage',
    'dmp'=>'application/vnd.tcpdump.pcap',
    'dms'=>'application/octet-stream',
    'dna'=>'application/vnd.dna',
    'doc'=>'application/msword',
    'docm'=>'application/vnd.ms-word.document.macroenabled.12',
    'docx'=>'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    'dot'=>'application/msword',
    'dotm'=>'application/vnd.ms-word.template.macroenabled.12',
    'dotx'=>'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
    'dp'=>'application/vnd.osgi.dp',
    'dpg'=>'application/vnd.dpgraph',
    'dra'=>'audio/vnd.dra',
    'dsc'=>'text/prs.lines.tag',
    'dssc'=>'application/dssc+der',
    'dtb'=>'application/x-dtbook+xml',
    'dtd'=>'application/xml-dtd',
    'dts'=>'audio/vnd.dts',
    'dtshd'=>'audio/vnd.dts.hd',
    'dump'=>'application/octet-stream',
    'dvb'=>'video/vnd.dvb.file',
    'dvi'=>'application/x-dvi',
    'dwf'=>'model/vnd.dwf',
    'dwg'=>'image/vnd.dwg',
    'dxf'=>'image/vnd.dxf',
    'dxp'=>'application/vnd.spotfire.dxp',
    'dxr'=>'application/x-director',
    'ecelp4800'=>'audio/vnd.nuera.ecelp4800',
    'ecelp7470'=>'audio/vnd.nuera.ecelp7470',
    'ecelp9600'=>'audio/vnd.nuera.ecelp9600',
    'ecma'=>'application/ecmascript',
    'edm'=>'application/vnd.novadigm.edm',
    'edx'=>'application/vnd.novadigm.edx',
    'efif'=>'application/vnd.picsel',
    'ei6'=>'application/vnd.pg.osasli',
    'elc'=>'application/octet-stream',
    'emf'=>'application/x-msmetafile',
    'eml'=>'message/rfc822',
    'emma'=>'application/emma+xml',
    'emz'=>'application/x-msmetafile',
    'eol'=>'audio/vnd.digital-winds',
    'eot'=>'application/vnd.ms-fontobject',
    'eps'=>'application/postscript',
    'epub'=>'application/epub+zip',
    'es3'=>'application/vnd.eszigno3+xml',
    'esa'=>'application/vnd.osgi.subsystem',
    'esf'=>'application/vnd.epson.esf',
    'et3'=>'application/vnd.eszigno3+xml',
    'etx'=>'text/x-setext',
    'eva'=>'application/x-eva',
    'evy'=>'application/x-envoy',
    'exe'=>'application/x-msdownload',
    'exi'=>'application/exi',
    'ext'=>'application/vnd.novadigm.ext',
    'ez'=>'application/andrew-inset',
    'ez2'=>'application/vnd.ezpix-album',
    'ez3'=>'application/vnd.ezpix-package',
    'f'=>'text/x-fortran',
    'f4v'=>'video/x-f4v',
    'f77'=>'text/x-fortran',
    'f90'=>'text/x-fortran',
    'fbs'=>'image/vnd.fastbidsheet',
    'fcdt'=>'application/vnd.adobe.formscentral.fcdt',
    'fcs'=>'application/vnd.isac.fcs',
    'fdf'=>'application/vnd.fdf',
    'fe_launch'=>'application/vnd.denovo.fcselayout-link',
    'fg5'=>'application/vnd.fujitsu.oasysgp',
    'fgd'=>'application/x-director',
    'fh'=>'image/x-freehand',
    'fh4'=>'image/x-freehand',
    'fh5'=>'image/x-freehand',
    'fh7'=>'image/x-freehand',
    'fhc'=>'image/x-freehand',
    'fig'=>'application/x-xfig',
    'flac'=>'audio/x-flac',
    'fli'=>'video/x-fli',
    'flo'=>'application/vnd.micrografx.flo',
    'flv'=>'video/x-flv',
    'flw'=>'application/vnd.kde.kivio',
    'flx'=>'text/vnd.fmi.flexstor',
    'fly'=>'text/vnd.fly',
    'fm'=>'application/vnd.framemaker',
    'fnc'=>'application/vnd.frogans.fnc',
    'for'=>'text/x-fortran',
    'fpx'=>'image/vnd.fpx',
    'frame'=>'application/vnd.framemaker',
    'fsc'=>'application/vnd.fsc.weblaunch',
    'fst'=>'image/vnd.fst',
    'ftc'=>'application/vnd.fluxtime.clip',
    'fti'=>'application/vnd.anser-web-funds-transfer-initiation',
    'fvt'=>'video/vnd.fvt',
    'fxp'=>'application/vnd.adobe.fxp',
    'fxpl'=>'application/vnd.adobe.fxp',
    'fzs'=>'application/vnd.fuzzysheet',
    'g2w'=>'application/vnd.geoplan',
    'g3'=>'image/g3fax',
    'g3w'=>'application/vnd.geospace',
    'gac'=>'application/vnd.groove-account',
    'gam'=>'application/x-tads',
    'gbr'=>'application/rpki-ghostbusters',
    'gca'=>'application/x-gca-compressed',
    'gdl'=>'model/vnd.gdl',
    'geo'=>'application/vnd.dynageo',
    'gex'=>'application/vnd.geometry-explorer',
    'ggb'=>'application/vnd.geogebra.file',
    'ggt'=>'application/vnd.geogebra.tool',
    'ghf'=>'application/vnd.groove-help',
    'gif'=>'image/gif',
    'gim'=>'application/vnd.groove-identity-message',
    'gml'=>'application/gml+xml',
    'gmx'=>'application/vnd.gmx',
    'gnumeric'=>'application/x-gnumeric',
    'gph'=>'application/vnd.flographit',
    'gpx'=>'application/gpx+xml',
    'gqf'=>'application/vnd.grafeq',
    'gqs'=>'application/vnd.grafeq',
    'gram'=>'application/srgs',
    'gramps'=>'application/x-gramps-xml',
    'gre'=>'application/vnd.geometry-explorer',
    'grv'=>'application/vnd.groove-injector',
    'grxml'=>'application/srgs+xml',
    'gsf'=>'application/x-font-ghostscript',
    'gtar'=>'application/x-gtar',
    'gtm'=>'application/vnd.groove-tool-message',
    'gtw'=>'model/vnd.gtw',
    'gv'=>'text/vnd.graphviz',
    'gxf'=>'application/gxf',
    'gxt'=>'application/vnd.geonext',
    'h'=>'text/x-c',
    'h261'=>'video/h261',
    'h263'=>'video/h263',
    'h264'=>'video/h264',
    'hal'=>'application/vnd.hal+xml',
    'hbci'=>'application/vnd.hbci',
    'hdf'=>'application/x-hdf',
    'hh'=>'text/x-c',
    'hlp'=>'application/winhlp',
    'hpgl'=>'application/vnd.hp-hpgl',
    'hpid'=>'application/vnd.hp-hpid',
    'hps'=>'application/vnd.hp-hps',
    'hqx'=>'application/mac-binhex40',
    'htke'=>'application/vnd.kenameaapp',
    'htm'=>'text/html',
    'html'=>'text/html',
    'hvd'=>'application/vnd.yamaha.hv-dic',
    'hvp'=>'application/vnd.yamaha.hv-voice',
    'hvs'=>'application/vnd.yamaha.hv-script',
    'i2g'=>'application/vnd.intergeo',
    'icc'=>'application/vnd.iccprofile',
    'ice'=>'x-conference/x-cooltalk',
    'icm'=>'application/vnd.iccprofile',
    'ico'=>'image/x-icon',
    'ics'=>'text/calendar',
    'ief'=>'image/ief',
    'ifb'=>'text/calendar',
    'ifm'=>'application/vnd.shana.informed.formdata',
    'iges'=>'model/iges',
    'igl'=>'application/vnd.igloader',
    'igm'=>'application/vnd.insors.igm',
    'igs'=>'model/iges',
    'igx'=>'application/vnd.micrografx.igx',
    'iif'=>'application/vnd.shana.informed.interchange',
    'imp'=>'application/vnd.accpac.simply.imp',
    'ims'=>'application/vnd.ms-ims',
    'in'=>'text/plain',
    'ink'=>'application/inkml+xml',
    'inkml'=>'application/inkml+xml',
    'install'=>'application/x-install-instructions',
    'iota'=>'application/vnd.astraea-software.iota',
    'ipfix'=>'application/ipfix',
    'ipk'=>'application/vnd.shana.informed.package',
    'irm'=>'application/vnd.ibm.rights-management',
    'irp'=>'application/vnd.irepository.package+xml',
    'iso'=>'application/x-iso9660-image',
    'itp'=>'application/vnd.shana.informed.formtemplate',
    'ivp'=>'application/vnd.immervision-ivp',
    'ivu'=>'application/vnd.immervision-ivu',
    'jad'=>'text/vnd.sun.j2me.app-descriptor',
    'jam'=>'application/vnd.jam',
    'jar'=>'application/java-archive',
    'java'=>'text/x-java-source',
    'jisp'=>'application/vnd.jisp',
    'jlt'=>'application/vnd.hp-jlyt',
    'jnlp'=>'application/x-java-jnlp-file',
    'joda'=>'application/vnd.joost.joda-archive',
    'jpe'=>'image/jpeg',
    'jpeg'=>'image/jpeg',
    'jpg'=>'image/jpeg',
    'jpgm'=>'video/jpm',
    'jpgv'=>'video/jpeg',
    'jpm'=>'video/jpm',
    'js'=>'application/javascript',
    'json'=>'application/json',
    'jsonml'=>'application/jsonml+json',
    'kar'=>'audio/midi',
    'karbon'=>'application/vnd.kde.karbon',
    'kfo'=>'application/vnd.kde.kformula',
    'kia'=>'application/vnd.kidspiration',
    'kml'=>'application/vnd.google-earth.kml+xml',
    'kmz'=>'application/vnd.google-earth.kmz',
    'kne'=>'application/vnd.kinar',
    'knp'=>'application/vnd.kinar',
    'kon'=>'application/vnd.kde.kontour',
    'kpr'=>'application/vnd.kde.kpresenter',
    'kpt'=>'application/vnd.kde.kpresenter',
    'kpxx'=>'application/vnd.ds-keypoint',
    'ksp'=>'application/vnd.kde.kspread',
    'ktr'=>'application/vnd.kahootz',
    'ktx'=>'image/ktx',
    'ktz'=>'application/vnd.kahootz',
    'kwd'=>'application/vnd.kde.kword',
    'kwt'=>'application/vnd.kde.kword',
    'lasxml'=>'application/vnd.las.las+xml',
    'latex'=>'application/x-latex',
    'lbd'=>'application/vnd.llamagraphics.life-balance.desktop',
    'lbe'=>'application/vnd.llamagraphics.life-balance.exchange+xml',
    'les'=>'application/vnd.hhe.lesson-player',
    'lha'=>'application/x-lzh-compressed',
    'link66'=>'application/vnd.route66.link66+xml',
    'list'=>'text/plain',
    'list3820'=>'application/vnd.ibm.modcap',
    'listafp'=>'application/vnd.ibm.modcap',
    'lnk'=>'application/x-ms-shortcut',
    'log'=>'text/plain',
    'lostxml'=>'application/lost+xml',
    'lrf'=>'application/octet-stream',
    'lrm'=>'application/vnd.ms-lrm',
    'ltf'=>'application/vnd.frogans.ltf',
    'lvp'=>'audio/vnd.lucent.voice',
    'lwp'=>'application/vnd.lotus-wordpro',
    'lzh'=>'application/x-lzh-compressed',
    'm13'=>'application/x-msmediaview',
    'm14'=>'application/x-msmediaview',
    'm1v'=>'video/mpeg',
    'm21'=>'application/mp21',
    'm2a'=>'audio/mpeg',
    'm2v'=>'video/mpeg',
    'm3a'=>'audio/mpeg',
    'm3u'=>'audio/x-mpegurl',
    'm3u8'=>'application/vnd.apple.mpegurl',
    'm4u'=>'video/vnd.mpegurl',
    'm4v'=>'video/x-m4v',
    'ma'=>'application/mathematica',
    'mads'=>'application/mads+xml',
    'mag'=>'application/vnd.ecowin.chart',
    'maker'=>'application/vnd.framemaker',
    'man'=>'text/troff',
    'mar'=>'application/octet-stream',
    'mathml'=>'application/mathml+xml',
    'mb'=>'application/mathematica',
    'mbk'=>'application/vnd.mobius.mbk',
    'mbox'=>'application/mbox',
    'mc1'=>'application/vnd.medcalcdata',
    'mcd'=>'application/vnd.mcd',
    'mcurl'=>'text/vnd.curl.mcurl',
    'mdb'=>'application/x-msaccess',
    'mdi'=>'image/vnd.ms-modi',
    'me'=>'text/troff',
    'mesh'=>'model/mesh',
    'meta4'=>'application/metalink4+xml',
    'metalink'=>'application/metalink+xml',
    'mets'=>'application/mets+xml',
    'mfm'=>'application/vnd.mfmp',
    'mft'=>'application/rpki-manifest',
    'mgp'=>'application/vnd.osgeo.mapguide.package',
    'mgz'=>'application/vnd.proteus.magazine',
    'mid'=>'audio/midi',
    'midi'=>'audio/midi',
    'mie'=>'application/x-mie',
    'mif'=>'application/vnd.mif',
    'mime'=>'message/rfc822',
    'mj2'=>'video/mj2',
    'mjp2'=>'video/mj2',
    'mk3d'=>'video/x-matroska',
    'mka'=>'audio/x-matroska',
    'mks'=>'video/x-matroska',
    'mkv'=>'video/x-matroska',
    'mlp'=>'application/vnd.dolby.mlp',
    'mmd'=>'application/vnd.chipnuts.karaoke-mmd',
    'mmf'=>'application/vnd.smaf',
    'mmr'=>'image/vnd.fujixerox.edmics-mmr',
    'mng'=>'video/x-mng',
    'mny'=>'application/x-msmoney',
    'mobi'=>'application/x-mobipocket-ebook',
    'mods'=>'application/mods+xml',
    'mov'=>'video/quicktime',
    'movie'=>'video/x-sgi-movie',
    'mp2'=>'audio/mpeg',
    'mp21'=>'application/mp21',
    'mp2a'=>'audio/mpeg',
    'mp3'=>'audio/mpeg',
    'mp4'=>'video/mp4',
    'mp4a'=>'audio/mp4',
    'mp4s'=>'application/mp4',
    'mp4v'=>'video/mp4',
    'mpc'=>'application/vnd.mophun.certificate',
    'mpe'=>'video/mpeg',
    'mpeg'=>'video/mpeg',
    'mpg'=>'video/mpeg',
    'mpg4'=>'video/mp4',
    'mpga'=>'audio/mpeg',
    'mpkg'=>'application/vnd.apple.installer+xml',
    'mpm'=>'application/vnd.blueice.multipass',
    'mpn'=>'application/vnd.mophun.application',
    'mpp'=>'application/vnd.ms-project',
    'mpt'=>'application/vnd.ms-project',
    'mpy'=>'application/vnd.ibm.minipay',
    'mqy'=>'application/vnd.mobius.mqy',
    'mrc'=>'application/marc',
    'mrcx'=>'application/marcxml+xml',
    'ms'=>'text/troff',
    'mscml'=>'application/mediaservercontrol+xml',
    'mseed'=>'application/vnd.fdsn.mseed',
    'mseq'=>'application/vnd.mseq',
    'msf'=>'application/vnd.epson.msf',
    'msh'=>'model/mesh',
    'msi'=>'application/x-msdownload',
    'msl'=>'application/vnd.mobius.msl',
    'msty'=>'application/vnd.muvee.style',
    'mts'=>'model/vnd.mts',
    'mus'=>'application/vnd.musician',
    'musicxml'=>'application/vnd.recordare.musicxml+xml',
    'mvb'=>'application/x-msmediaview',
    'mwf'=>'application/vnd.mfer',
    'mxf'=>'application/mxf',
    'mxl'=>'application/vnd.recordare.musicxml',
    'mxml'=>'application/xv+xml',
    'mxs'=>'application/vnd.triscape.mxs',
    'mxu'=>'video/vnd.mpegurl',
    'n-gage'=>'application/vnd.nokia.n-gage.symbian.install',
    'n3'=>'text/n3',
    'nb'=>'application/mathematica',
    'nbp'=>'application/vnd.wolfram.player',
    'nc'=>'application/x-netcdf',
    'ncx'=>'application/x-dtbncx+xml',
    'nfo'=>'text/x-nfo',
    'ngdat'=>'application/vnd.nokia.n-gage.data',
    'nitf'=>'application/vnd.nitf',
    'nlu'=>'application/vnd.neurolanguage.nlu',
    'nml'=>'application/vnd.enliven',
    'nnd'=>'application/vnd.noblenet-directory',
    'nns'=>'application/vnd.noblenet-sealer',
    'nnw'=>'application/vnd.noblenet-web',
    'npx'=>'image/vnd.net-fpx',
    'nsc'=>'application/x-conference',
    'nsf'=>'application/vnd.lotus-notes',
    'ntf'=>'application/vnd.nitf',
    'nzb'=>'application/x-nzb',
    'oa2'=>'application/vnd.fujitsu.oasys2',
    'oa3'=>'application/vnd.fujitsu.oasys3',
    'oas'=>'application/vnd.fujitsu.oasys',
    'obd'=>'application/x-msbinder',
    'obj'=>'application/x-tgif',
    'oda'=>'application/oda',
    'odb'=>'application/vnd.oasis.opendocument.database',
    'odc'=>'application/vnd.oasis.opendocument.chart',
    'odf'=>'application/vnd.oasis.opendocument.formula',
    'odft'=>'application/vnd.oasis.opendocument.formula-template',
    'odg'=>'application/vnd.oasis.opendocument.graphics',
    'odi'=>'application/vnd.oasis.opendocument.image',
    'odm'=>'application/vnd.oasis.opendocument.text-master',
    'odp'=>'application/vnd.oasis.opendocument.presentation',
    'ods'=>'application/vnd.oasis.opendocument.spreadsheet',
    'odt'=>'application/vnd.oasis.opendocument.text',
    'oga'=>'audio/ogg',
    'ogg'=>'audio/ogg',
    'ogv'=>'video/ogg',
    'ogx'=>'application/ogg',
    'omdoc'=>'application/omdoc+xml',
    'onepkg'=>'application/onenote',
    'onetmp'=>'application/onenote',
    'onetoc'=>'application/onenote',
    'onetoc2'=>'application/onenote',
    'opf'=>'application/oebps-package+xml',
    'opml'=>'text/x-opml',
    'oprc'=>'application/vnd.palm',
    'org'=>'application/vnd.lotus-organizer',
    'osf'=>'application/vnd.yamaha.openscoreformat',
    'osfpvg'=>'application/vnd.yamaha.openscoreformat.osfpvg+xml',
    'otc'=>'application/vnd.oasis.opendocument.chart-template',
    'otf'=>'application/x-font-otf',
    'otg'=>'application/vnd.oasis.opendocument.graphics-template',
    'oth'=>'application/vnd.oasis.opendocument.text-web',
    'oti'=>'application/vnd.oasis.opendocument.image-template',
    'otp'=>'application/vnd.oasis.opendocument.presentation-template',
    'ots'=>'application/vnd.oasis.opendocument.spreadsheet-template',
    'ott'=>'application/vnd.oasis.opendocument.text-template',
    'oxps'=>'application/oxps',
    'oxt'=>'application/vnd.openofficeorg.extension',
    'p'=>'text/x-pascal',
    'p10'=>'application/pkcs10',
    'p12'=>'application/x-pkcs12',
    'p7b'=>'application/x-pkcs7-certificates',
    'p7c'=>'application/pkcs7-mime',
    'p7m'=>'application/pkcs7-mime',
    'p7r'=>'application/x-pkcs7-certreqresp',
    'p7s'=>'application/pkcs7-signature',
    'p8'=>'application/pkcs8',
    'pas'=>'text/x-pascal',
    'paw'=>'application/vnd.pawaafile',
    'pbd'=>'application/vnd.powerbuilder6',
    'pbm'=>'image/x-portable-bitmap',
    'pcap'=>'application/vnd.tcpdump.pcap',
    'pcf'=>'application/x-font-pcf',
    'pcl'=>'application/vnd.hp-pcl',
    'pclxl'=>'application/vnd.hp-pclxl',
    'pct'=>'image/x-pict',
    'pcurl'=>'application/vnd.curl.pcurl',
    'pcx'=>'image/x-pcx',
    'pdb'=>'application/vnd.palm',
    'pdf'=>'application/pdf',
    'pfa'=>'application/x-font-type1',
    'pfb'=>'application/x-font-type1',
    'pfm'=>'application/x-font-type1',
    'pfr'=>'application/font-tdpfr',
    'pfx'=>'application/x-pkcs12',
    'pgm'=>'image/x-portable-graymap',
    'pgn'=>'application/x-chess-pgn',
    'pgp'=>'application/pgp-encrypted',
    'pic'=>'image/x-pict',
    'pkg'=>'application/octet-stream',
    'pki'=>'application/pkixcmp',
    'pkipath'=>'application/pkix-pkipath',
    'plb'=>'application/vnd.3gpp.pic-bw-large',
    'plc'=>'application/vnd.mobius.plc',
    'plf'=>'application/vnd.pocketlearn',
    'pls'=>'application/pls+xml',
    'pml'=>'application/vnd.ctc-posml',
    'png'=>'image/png',
    'pnm'=>'image/x-portable-anymap',
    'portpkg'=>'application/vnd.macports.portpkg',
    'pot'=>'application/vnd.ms-powerpoint',
    '