Tutorial :Get MIME type from filename extension



Question:

How can I get the MIME type from a file extension?


Solution:1

UPDATE

For up-to-date mapping with additions from many contributors, see this GitHub repository:

https://github.com/samuelneff/MimeTypeMap


I've found many mime types my application uses are not in the default Windows registry and others are in the registry but not in the list included with IIS. I've compiled a list from these locations and added a few others that we use.

EDIT: See most up-do-date version with contributions here, including an efficient and deterministic two-way mapping.

The NuGet package is also available.

private static IDictionary<string, string> _mappings = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) {            #region Big freaking list of mime types          // combination of values from Windows 7 Registry and           // from C:\Windows\System32\inetsrv\config\applicationHost.config          // some added, including .7z and .dat          {".323", "text/h323"},          {".3g2", "video/3gpp2"},          {".3gp", "video/3gpp"},          {".3gp2", "video/3gpp2"},          {".3gpp", "video/3gpp"},          {".7z", "application/x-7z-compressed"},          {".aa", "audio/audible"},          {".AAC", "audio/aac"},          {".aaf", "application/octet-stream"},          {".aax", "audio/vnd.audible.aax"},          {".ac3", "audio/ac3"},          {".aca", "application/octet-stream"},          {".accda", "application/msaccess.addin"},          {".accdb", "application/msaccess"},          {".accdc", "application/msaccess.cab"},          {".accde", "application/msaccess"},          {".accdr", "application/msaccess.runtime"},          {".accdt", "application/msaccess"},          {".accdw", "application/msaccess.webapplication"},          {".accft", "application/msaccess.ftemplate"},          {".acx", "application/internet-property-stream"},          {".AddIn", "text/xml"},          {".ade", "application/msaccess"},          {".adobebridge", "application/x-bridge-url"},          {".adp", "application/msaccess"},          {".ADT", "audio/vnd.dlna.adts"},          {".ADTS", "audio/aac"},          {".afm", "application/octet-stream"},          {".ai", "application/postscript"},          {".aif", "audio/x-aiff"},          {".aifc", "audio/aiff"},          {".aiff", "audio/aiff"},          {".air", "application/vnd.adobe.air-application-installer-package+zip"},          {".amc", "application/x-mpeg"},          {".application", "application/x-ms-application"},          {".art", "image/x-jg"},          {".asa", "application/xml"},          {".asax", "application/xml"},          {".ascx", "application/xml"},          {".asd", "application/octet-stream"},          {".asf", "video/x-ms-asf"},          {".ashx", "application/xml"},          {".asi", "application/octet-stream"},          {".asm", "text/plain"},          {".asmx", "application/xml"},          {".aspx", "application/xml"},          {".asr", "video/x-ms-asf"},          {".asx", "video/x-ms-asf"},          {".atom", "application/atom+xml"},          {".au", "audio/basic"},          {".avi", "video/x-msvideo"},          {".axs", "application/olescript"},          {".bas", "text/plain"},          {".bcpio", "application/x-bcpio"},          {".bin", "application/octet-stream"},          {".bmp", "image/bmp"},          {".c", "text/plain"},          {".cab", "application/octet-stream"},          {".caf", "audio/x-caf"},          {".calx", "application/vnd.ms-office.calx"},          {".cat", "application/vnd.ms-pki.seccat"},          {".cc", "text/plain"},          {".cd", "text/plain"},          {".cdda", "audio/aiff"},          {".cdf", "application/x-cdf"},          {".cer", "application/x-x509-ca-cert"},          {".chm", "application/octet-stream"},          {".class", "application/x-java-applet"},          {".clp", "application/x-msclip"},          {".cmx", "image/x-cmx"},          {".cnf", "text/plain"},          {".cod", "image/cis-cod"},          {".config", "application/xml"},          {".contact", "text/x-ms-contact"},          {".coverage", "application/xml"},          {".cpio", "application/x-cpio"},          {".cpp", "text/plain"},          {".crd", "application/x-mscardfile"},          {".crl", "application/pkix-crl"},          {".crt", "application/x-x509-ca-cert"},          {".cs", "text/plain"},          {".csdproj", "text/plain"},          {".csh", "application/x-csh"},          {".csproj", "text/plain"},          {".css", "text/css"},          {".csv", "text/csv"},          {".cur", "application/octet-stream"},          {".cxx", "text/plain"},          {".dat", "application/octet-stream"},          {".datasource", "application/xml"},          {".dbproj", "text/plain"},          {".dcr", "application/x-director"},          {".def", "text/plain"},          {".deploy", "application/octet-stream"},          {".der", "application/x-x509-ca-cert"},          {".dgml", "application/xml"},          {".dib", "image/bmp"},          {".dif", "video/x-dv"},          {".dir", "application/x-director"},          {".disco", "text/xml"},          {".dll", "application/x-msdownload"},          {".dll.config", "text/xml"},          {".dlm", "text/dlm"},          {".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"},          {".dsp", "application/octet-stream"},          {".dsw", "text/plain"},          {".dtd", "text/xml"},          {".dtsConfig", "text/xml"},          {".dv", "video/x-dv"},          {".dvi", "application/x-dvi"},          {".dwf", "drawing/x-dwf"},          {".dwp", "application/octet-stream"},          {".dxr", "application/x-director"},          {".eml", "message/rfc822"},          {".emz", "application/octet-stream"},          {".eot", "application/octet-stream"},          {".eps", "application/postscript"},          {".etl", "application/etl"},          {".etx", "text/x-setext"},          {".evy", "application/envoy"},          {".exe", "application/octet-stream"},          {".exe.config", "text/xml"},          {".fdf", "application/vnd.fdf"},          {".fif", "application/fractals"},          {".filters", "Application/xml"},          {".fla", "application/octet-stream"},          {".flr", "x-world/x-vrml"},          {".flv", "video/x-flv"},          {".fsscript", "application/fsharp-script"},          {".fsx", "application/fsharp-script"},          {".generictest", "application/xml"},          {".gif", "image/gif"},          {".group", "text/x-ms-group"},          {".gsm", "audio/x-gsm"},          {".gtar", "application/x-gtar"},          {".gz", "application/x-gzip"},          {".h", "text/plain"},          {".hdf", "application/x-hdf"},          {".hdml", "text/x-hdml"},          {".hhc", "application/x-oleobject"},          {".hhk", "application/octet-stream"},          {".hhp", "application/octet-stream"},          {".hlp", "application/winhlp"},          {".hpp", "text/plain"},          {".hqx", "application/mac-binhex40"},          {".hta", "application/hta"},          {".htc", "text/x-component"},          {".htm", "text/html"},          {".html", "text/html"},          {".htt", "text/webviewhtml"},          {".hxa", "application/xml"},          {".hxc", "application/xml"},          {".hxd", "application/octet-stream"},          {".hxe", "application/xml"},          {".hxf", "application/xml"},          {".hxh", "application/octet-stream"},          {".hxi", "application/octet-stream"},          {".hxk", "application/xml"},          {".hxq", "application/octet-stream"},          {".hxr", "application/octet-stream"},          {".hxs", "application/octet-stream"},          {".hxt", "text/html"},          {".hxv", "application/xml"},          {".hxw", "application/octet-stream"},          {".hxx", "text/plain"},          {".i", "text/plain"},          {".ico", "image/x-icon"},          {".ics", "application/octet-stream"},          {".idl", "text/plain"},          {".ief", "image/ief"},          {".iii", "application/x-iphone"},          {".inc", "text/plain"},          {".inf", "application/octet-stream"},          {".inl", "text/plain"},          {".ins", "application/x-internet-signup"},          {".ipa", "application/x-itunes-ipa"},          {".ipg", "application/x-itunes-ipg"},          {".ipproj", "text/plain"},          {".ipsw", "application/x-itunes-ipsw"},          {".iqy", "text/x-ms-iqy"},          {".isp", "application/x-internet-signup"},          {".ite", "application/x-itunes-ite"},          {".itlp", "application/x-itunes-itlp"},          {".itms", "application/x-itunes-itms"},          {".itpc", "application/x-itunes-itpc"},          {".IVF", "video/x-ivf"},          {".jar", "application/java-archive"},          {".java", "application/octet-stream"},          {".jck", "application/liquidmotion"},          {".jcz", "application/liquidmotion"},          {".jfif", "image/pjpeg"},          {".jnlp", "application/x-java-jnlp-file"},          {".jpb", "application/octet-stream"},          {".jpe", "image/jpeg"},          {".jpeg", "image/jpeg"},          {".jpg", "image/jpeg"},          {".js", "application/x-javascript"},          {".json", "application/json"},          {".jsx", "text/jscript"},          {".jsxbin", "text/plain"},          {".latex", "application/x-latex"},          {".library-ms", "application/windows-library+xml"},          {".lit", "application/x-ms-reader"},          {".loadtest", "application/xml"},          {".lpk", "application/octet-stream"},          {".lsf", "video/x-la-asf"},          {".lst", "text/plain"},          {".lsx", "video/x-la-asf"},          {".lzh", "application/octet-stream"},          {".m13", "application/x-msmediaview"},          {".m14", "application/x-msmediaview"},          {".m1v", "video/mpeg"},          {".m2t", "video/vnd.dlna.mpeg-tts"},          {".m2ts", "video/vnd.dlna.mpeg-tts"},          {".m2v", "video/mpeg"},          {".m3u", "audio/x-mpegurl"},          {".m3u8", "audio/x-mpegurl"},          {".m4a", "audio/m4a"},          {".m4b", "audio/m4b"},          {".m4p", "audio/m4p"},          {".m4r", "audio/x-m4r"},          {".m4v", "video/x-m4v"},          {".mac", "image/x-macpaint"},          {".mak", "text/plain"},          {".man", "application/x-troff-man"},          {".manifest", "application/x-ms-manifest"},          {".map", "text/plain"},          {".master", "application/xml"},          {".mda", "application/msaccess"},          {".mdb", "application/x-msaccess"},          {".mde", "application/msaccess"},          {".mdp", "application/octet-stream"},          {".me", "application/x-troff-me"},          {".mfp", "application/x-shockwave-flash"},          {".mht", "message/rfc822"},          {".mhtml", "message/rfc822"},          {".mid", "audio/mid"},          {".midi", "audio/mid"},          {".mix", "application/octet-stream"},          {".mk", "text/plain"},          {".mmf", "application/x-smaf"},          {".mno", "text/xml"},          {".mny", "application/x-msmoney"},          {".mod", "video/mpeg"},          {".mov", "video/quicktime"},          {".movie", "video/x-sgi-movie"},          {".mp2", "video/mpeg"},          {".mp2v", "video/mpeg"},          {".mp3", "audio/mpeg"},          {".mp4", "video/mp4"},          {".mp4v", "video/mp4"},          {".mpa", "video/mpeg"},          {".mpe", "video/mpeg"},          {".mpeg", "video/mpeg"},          {".mpf", "application/vnd.ms-mediapackage"},          {".mpg", "video/mpeg"},          {".mpp", "application/vnd.ms-project"},          {".mpv2", "video/mpeg"},          {".mqv", "video/quicktime"},          {".ms", "application/x-troff-ms"},          {".msi", "application/octet-stream"},          {".mso", "application/octet-stream"},          {".mts", "video/vnd.dlna.mpeg-tts"},          {".mtx", "application/xml"},          {".mvb", "application/x-msmediaview"},          {".mvc", "application/x-miva-compiled"},          {".mxp", "application/x-mmxp"},          {".nc", "application/x-netcdf"},          {".nsc", "video/x-ms-asf"},          {".nws", "message/rfc822"},          {".ocx", "application/octet-stream"},          {".oda", "application/oda"},          {".odc", "text/x-ms-odc"},          {".odh", "text/plain"},          {".odl", "text/plain"},          {".odp", "application/vnd.oasis.opendocument.presentation"},          {".ods", "application/oleobject"},          {".odt", "application/vnd.oasis.opendocument.text"},          {".one", "application/onenote"},          {".onea", "application/onenote"},          {".onepkg", "application/onenote"},          {".onetmp", "application/onenote"},          {".onetoc", "application/onenote"},          {".onetoc2", "application/onenote"},          {".orderedtest", "application/xml"},          {".osdx", "application/opensearchdescription+xml"},          {".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"},          {".pbm", "image/x-portable-bitmap"},          {".pcast", "application/x-podcast"},          {".pct", "image/pict"},          {".pcx", "application/octet-stream"},          {".pcz", "application/octet-stream"},          {".pdf", "application/pdf"},          {".pfb", "application/octet-stream"},          {".pfm", "application/octet-stream"},          {".pfx", "application/x-pkcs12"},          {".pgm", "image/x-portable-graymap"},          {".pic", "image/pict"},          {".pict", "image/pict"},          {".pkgdef", "text/plain"},          {".pkgundef", "text/plain"},          {".pko", "application/vnd.ms-pki.pko"},          {".pls", "audio/scpls"},          {".pma", "application/x-perfmon"},          {".pmc", "application/x-perfmon"},          {".pml", "application/x-perfmon"},          {".pmr", "application/x-perfmon"},          {".pmw", "application/x-perfmon"},          {".png", "image/png"},          {".pnm", "image/x-portable-anymap"},          {".pnt", "image/x-macpaint"},          {".pntg", "image/x-macpaint"},          {".pnz", "image/png"},          {".pot", "application/vnd.ms-powerpoint"},          {".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12"},          {".potx", "application/vnd.openxmlformats-officedocument.presentationml.template"},          {".ppa", "application/vnd.ms-powerpoint"},          {".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"},          {".ppm", "image/x-portable-pixmap"},          {".pps", "application/vnd.ms-powerpoint"},          {".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"},          {".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"},          {".ppt", "application/vnd.ms-powerpoint"},          {".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"},          {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},          {".prf", "application/pics-rules"},          {".prm", "application/octet-stream"},          {".prx", "application/octet-stream"},          {".ps", "application/postscript"},          {".psc1", "application/PowerShell"},          {".psd", "application/octet-stream"},          {".psess", "application/xml"},          {".psm", "application/octet-stream"},          {".psp", "application/octet-stream"},          {".pub", "application/x-mspublisher"},          {".pwz", "application/vnd.ms-powerpoint"},          {".qht", "text/x-html-insertion"},          {".qhtm", "text/x-html-insertion"},          {".qt", "video/quicktime"},          {".qti", "image/x-quicktime"},          {".qtif", "image/x-quicktime"},          {".qtl", "application/x-quicktimeplayer"},          {".qxd", "application/octet-stream"},          {".ra", "audio/x-pn-realaudio"},          {".ram", "audio/x-pn-realaudio"},          {".rar", "application/octet-stream"},          {".ras", "image/x-cmu-raster"},          {".rat", "application/rat-file"},          {".rc", "text/plain"},          {".rc2", "text/plain"},          {".rct", "text/plain"},          {".rdlc", "application/xml"},          {".resx", "application/xml"},          {".rf", "image/vnd.rn-realflash"},          {".rgb", "image/x-rgb"},          {".rgs", "text/plain"},          {".rm", "application/vnd.rn-realmedia"},          {".rmi", "audio/mid"},          {".rmp", "application/vnd.rn-rn_music_package"},          {".roff", "application/x-troff"},          {".rpm", "audio/x-pn-realaudio-plugin"},          {".rqy", "text/x-ms-rqy"},          {".rtf", "application/rtf"},          {".rtx", "text/richtext"},          {".ruleset", "application/xml"},          {".s", "text/plain"},          {".safariextz", "application/x-safari-safariextz"},          {".scd", "application/x-msschedule"},          {".sct", "text/scriptlet"},          {".sd2", "audio/x-sd2"},          {".sdp", "application/sdp"},          {".sea", "application/octet-stream"},          {".searchConnector-ms", "application/windows-search-connector+xml"},          {".setpay", "application/set-payment-initiation"},          {".setreg", "application/set-registration-initiation"},          {".settings", "application/xml"},          {".sgimb", "application/x-sgimb"},          {".sgml", "text/sgml"},          {".sh", "application/x-sh"},          {".shar", "application/x-shar"},          {".shtml", "text/html"},          {".sit", "application/x-stuffit"},          {".sitemap", "application/xml"},          {".skin", "application/xml"},          {".sldm", "application/vnd.ms-powerpoint.slide.macroEnabled.12"},          {".sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide"},          {".slk", "application/vnd.ms-excel"},          {".sln", "text/plain"},          {".slupkg-ms", "application/x-ms-license"},          {".smd", "audio/x-smd"},          {".smi", "application/octet-stream"},          {".smx", "audio/x-smd"},          {".smz", "audio/x-smd"},          {".snd", "audio/basic"},          {".snippet", "application/xml"},          {".snp", "application/octet-stream"},          {".sol", "text/plain"},          {".sor", "text/plain"},          {".spc", "application/x-pkcs7-certificates"},          {".spl", "application/futuresplash"},          {".src", "application/x-wais-source"},          {".srf", "text/plain"},          {".SSISDeploymentManifest", "text/xml"},          {".ssm", "application/streamingmedia"},          {".sst", "application/vnd.ms-pki.certstore"},          {".stl", "application/vnd.ms-pki.stl"},          {".sv4cpio", "application/x-sv4cpio"},          {".sv4crc", "application/x-sv4crc"},          {".svc", "application/xml"},          {".swf", "application/x-shockwave-flash"},          {".t", "application/x-troff"},          {".tar", "application/x-tar"},          {".tcl", "application/x-tcl"},          {".testrunconfig", "application/xml"},          {".testsettings", "application/xml"},          {".tex", "application/x-tex"},          {".texi", "application/x-texinfo"},          {".texinfo", "application/x-texinfo"},          {".tgz", "application/x-compressed"},          {".thmx", "application/vnd.ms-officetheme"},          {".thn", "application/octet-stream"},          {".tif", "image/tiff"},          {".tiff", "image/tiff"},          {".tlh", "text/plain"},          {".tli", "text/plain"},          {".toc", "application/octet-stream"},          {".tr", "application/x-troff"},          {".trm", "application/x-msterminal"},          {".trx", "application/xml"},          {".ts", "video/vnd.dlna.mpeg-tts"},          {".tsv", "text/tab-separated-values"},          {".ttf", "application/octet-stream"},          {".tts", "video/vnd.dlna.mpeg-tts"},          {".txt", "text/plain"},          {".u32", "application/octet-stream"},          {".uls", "text/iuls"},          {".user", "text/plain"},          {".ustar", "application/x-ustar"},          {".vb", "text/plain"},          {".vbdproj", "text/plain"},          {".vbk", "video/mpeg"},          {".vbproj", "text/plain"},          {".vbs", "text/vbscript"},          {".vcf", "text/x-vcard"},          {".vcproj", "Application/xml"},          {".vcs", "text/plain"},          {".vcxproj", "Application/xml"},          {".vddproj", "text/plain"},          {".vdp", "text/plain"},          {".vdproj", "text/plain"},          {".vdx", "application/vnd.ms-visio.viewer"},          {".vml", "text/xml"},          {".vscontent", "application/xml"},          {".vsct", "text/xml"},          {".vsd", "application/vnd.visio"},          {".vsi", "application/ms-vsi"},          {".vsix", "application/vsix"},          {".vsixlangpack", "text/xml"},          {".vsixmanifest", "text/xml"},          {".vsmdi", "application/xml"},          {".vspscc", "text/plain"},          {".vss", "application/vnd.visio"},          {".vsscc", "text/plain"},          {".vssettings", "text/xml"},          {".vssscc", "text/plain"},          {".vst", "application/vnd.visio"},          {".vstemplate", "text/xml"},          {".vsto", "application/x-ms-vsto"},          {".vsw", "application/vnd.visio"},          {".vsx", "application/vnd.visio"},          {".vtx", "application/vnd.visio"},          {".wav", "audio/wav"},          {".wave", "audio/wav"},          {".wax", "audio/x-ms-wax"},          {".wbk", "application/msword"},          {".wbmp", "image/vnd.wap.wbmp"},          {".wcm", "application/vnd.ms-works"},          {".wdb", "application/vnd.ms-works"},          {".wdp", "image/vnd.ms-photo"},          {".webarchive", "application/x-safari-webarchive"},          {".webtest", "application/xml"},          {".wiq", "application/xml"},          {".wiz", "application/msword"},          {".wks", "application/vnd.ms-works"},          {".WLMP", "application/wlmoviemaker"},          {".wlpginstall", "application/x-wlpg-detect"},          {".wlpginstall3", "application/x-wlpg3-detect"},          {".wm", "video/x-ms-wm"},          {".wma", "audio/x-ms-wma"},          {".wmd", "application/x-ms-wmd"},          {".wmf", "application/x-msmetafile"},          {".wml", "text/vnd.wap.wml"},          {".wmlc", "application/vnd.wap.wmlc"},          {".wmls", "text/vnd.wap.wmlscript"},          {".wmlsc", "application/vnd.wap.wmlscriptc"},          {".wmp", "video/x-ms-wmp"},          {".wmv", "video/x-ms-wmv"},          {".wmx", "video/x-ms-wmx"},          {".wmz", "application/x-ms-wmz"},          {".wpl", "application/vnd.ms-wpl"},          {".wps", "application/vnd.ms-works"},          {".wri", "application/x-mswrite"},          {".wrl", "x-world/x-vrml"},          {".wrz", "x-world/x-vrml"},          {".wsc", "text/scriptlet"},          {".wsdl", "text/xml"},          {".wvx", "video/x-ms-wvx"},          {".x", "application/directx"},          {".xaf", "x-world/x-vrml"},          {".xaml", "application/xaml+xml"},          {".xap", "application/x-silverlight-app"},          {".xbap", "application/x-ms-xbap"},          {".xbm", "image/x-xbitmap"},          {".xdr", "text/plain"},          {".xht", "application/xhtml+xml"},          {".xhtml", "application/xhtml+xml"},          {".xla", "application/vnd.ms-excel"},          {".xlam", "application/vnd.ms-excel.addin.macroEnabled.12"},          {".xlc", "application/vnd.ms-excel"},          {".xld", "application/vnd.ms-excel"},          {".xlk", "application/vnd.ms-excel"},          {".xll", "application/vnd.ms-excel"},          {".xlm", "application/vnd.ms-excel"},          {".xls", "application/vnd.ms-excel"},          {".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"},          {".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"},          {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},          {".xlt", "application/vnd.ms-excel"},          {".xltm", "application/vnd.ms-excel.template.macroEnabled.12"},          {".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"},          {".xlw", "application/vnd.ms-excel"},          {".xml", "text/xml"},          {".xmta", "application/xml"},          {".xof", "x-world/x-vrml"},          {".XOML", "text/plain"},          {".xpm", "image/x-xpixmap"},          {".xps", "application/vnd.ms-xpsdocument"},          {".xrm-ms", "text/xml"},          {".xsc", "application/xml"},          {".xsd", "text/xml"},          {".xsf", "text/xml"},          {".xsl", "text/xml"},          {".xslt", "text/xml"},          {".xsn", "application/octet-stream"},          {".xss", "application/xml"},          {".xtp", "application/octet-stream"},          {".xwd", "image/x-xwindowdump"},          {".z", "application/x-compress"},          {".zip", "application/x-zip-compressed"},          





        
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