Taking it as a resounding no, I wrote my own. That's what Sundays were made for.
///<summary>Used to denote the encoding necessary for files containing JavaScript source code. The alternative MIME type for this file type is text/javascript.</summary>
public const string ApplicationXJavascript = "application/x-javascript";
///<summary>24bit?Linear PCM?audio at 8-48kHz, 1-N channels; Defined in?RFC 3190</summary>
public const string AudioL24 = "audio/L24";
///<summary>Adobe Flash?files for example with the extension .swf</summary>
public const string ApplicationXShockwaveFlash = "application/x-shockwave-flash";
///<summary>Arbitrary binary data.[5]?Generally speaking this type identifies files that are not associated with a specific application. Contrary to past assumptions by software packages such as?Apache?this is not a type that should be applied to unknown files. In such a case, a server or application should not indicate a content type, as it may be incorrect, but rather, should omit the type in order to allow the recipient to guess the type.[6]</summary>
public const string ApplicationOctetStream = "application/octet-stream";
///<summary>Atom feeds</summary>
public const string ApplicationAtomXml = "application/atom+xml";
///<summary>Cascading Style Sheets; Defined in?RFC 2318</summary>
public const string TextCss = "text/css";
///<summary>commands; subtype resident in?Gecko?browsers like?Firefox?3.5</summary>
public const string TextCmd = "text/cmd";
///<summary>Comma-separated values; Defined in?RFC 4180</summary>
public const string TextCsv = "text/csv";
///<summary>deb (file format), a software package format used by the Debian project</summary>
public const string ApplicationXDeb = "application/x-deb";
///<summary>Defined in?RFC 1847</summary>
public const string MultipartEncrypted = "multipart/encrypted";
///<summary>Defined in?RFC 1847</summary>
public const string MultipartSigned = "multipart/signed";
///<summary>Defined in?RFC 2616</summary>
public const string MessageHttp = "message/http";
///<summary>Defined in?RFC 4735</summary>
public const string ModelExample = "model/example";
///<summary>device-independent document in DVI format</summary>
public const string ApplicationXDvi = "application/x-dvi";
///<summary>DTD?files; Defined by?RFC 3023</summary>
public const string ApplicationXmlDtd = "application/xml-dtd";
///<summary>ECMAScript/JavaScript; Defined in?RFC 4329?(equivalent to?application/ecmascript?but with looser processing rules) It is not accepted in?IE 8?or earlier -?text/javascript?is accepted but it is defined as obsolete in?RFC 4329. The "type" attribute of the?<script>?tag in?HTML5?is optional and in practice omitting the media type of JavaScript programs is the most interoperable solution since all browsers have always assumed the correct default even before HTML5.</summary>
public const string ApplicationJavascript = "application/javascript";
///<summary>ECMAScript/JavaScript; Defined in?RFC 4329?(equivalent to?application/javascript?but with stricter processing rules)</summary>
public const string ApplicationEcmascript = "application/ecmascript";
///<summary>EDI?EDIFACT?data; Defined in?RFC 1767</summary>
public const string ApplicationEdifact = "application/EDIFACT";
///<summary>EDI?X12?data; Defined in?RFC 1767</summary>
public const string ApplicationEdiX12 = "application/EDI-X12";
///<summary>Email; Defined in?RFC 2045?and?RFC 2046</summary>
public const string MessagePartial = "message/partial";
///<summary>Email;?EML?files, MIME files,?MHT?files,?MHTML?files; Defined in?RFC 2045?and?RFC 2046</summary>
public const string MessageRfc822 = "message/rfc822";
///<summary>Extensible Markup Language; Defined in?RFC 3023</summary>
public const string TextXml = "text/xml";
///<summary>Extensible Markup Language; Defined in RFC 3023</summary>
public const string ApplicationXml = "application/xml";
///<summary>Flash video?(FLV files)</summary>
public const string VideoXFlv = "video/x-flv";
///<summary>GIF?image; Defined in?RFC 2045?and?RFC 2046</summary>
public const string ImageGif = "image/gif";
///<summary>GoogleWebToolkit data</summary>
public const string TextXGwtRpc = "text/x-gwt-rpc";
///<summary>Gzip</summary>
public const string ApplicationXGzip = "application/x-gzip";
///<summary>HTML; Defined in?RFC 2854</summary>
public const string TextHtml = "text/html";
///<summary>ICO?image; Registered[9]</summary>
public const string ImageVndMicrosoftIcon = "image/vnd.microsoft.icon";
///<summary>IGS files,?IGES?files; Defined in?RFC 2077</summary>
public const string ModelIges = "model/iges";
///<summary>IMDN?Instant Message Disposition Notification; Defined in?RFC 5438</summary>
public const string MessageImdnXml = "message/imdn+xml";
///<summary>JavaScript Object Notation?JSON; Defined in?RFC 4627</summary>
public const string ApplicationJson = "application/json";
///<summary>JavaScript Object Notation (JSON) Patch; Defined in?RFC 6902</summary>
public const string ApplicationJsonPatch = "application/json-patch+json";
///<summary>JavaScript - Defined in and obsoleted by?RFC 4329?in order to discourage its usage in favor of?application/javascript. However,text/javascript?is allowed in HTML 4 and 5 and, unlike?application/javascript, has cross-browser support. The "type" attribute of the?<script>?tag in?HTML5?is optional and there is no need to use it at all since all browsers have always assumed the correct default (even in HTML 4 where it was required by the specification).</summary>
[Obsolete]
public const string TextJavascript = "text/javascript";
///<summary>JPEG?JFIF image; Associated with Internet Explorer; Listed in?ms775147(v=vs.85)?- Progressive JPEG, initiated before global browser support for progressive JPEGs (Microsoft and Firefox).</summary>
public const string ImagePjpeg = "image/pjpeg";
///<summary>JPEG?JFIF image; Defined in?RFC 2045?and?RFC 2046</summary>
public const string ImageJpeg = "image/jpeg";
///<summary>jQuery?template data</summary>
public const string TextXJqueryTmpl = "text/x-jquery-tmpl";
///<summary>KML?files (e.g. for?Google Earth)</summary>
public const string ApplicationVndGoogleEarthKmlXml = "application/vnd.google-earth.kml+xml";
///<summary>LaTeX?files</summary>
public const string ApplicationXLatex = "application/x-latex";
///<summary>Matroska?open media format</summary>
public const string VideoXMatroska = "video/x-matroska";
///<summary>Microsoft Excel?2007 files</summary>
public const string ApplicationVndOpenxmlformatsOfficedocumentSpreadsheetmlSheet = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
///<summary>Microsoft Excel?files</summary>
public const string ApplicationVndMsExcel = "application/vnd.ms-excel";
///<summary>Microsoft Powerpoint?2007 files</summary>
public const string ApplicationVndOpenxmlformatsOfficedocumentPresentationmlPresentation = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
///<summary>Microsoft Powerpoint?files</summary>
public const string ApplicationVndMsPowerpoint = "application/vnd.ms-powerpoint";
///<summary>Microsoft Word?2007 files</summary>
public const string ApplicationVndOpenxmlformatsOfficedocumentWordprocessingmlDocument = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
///<summary>Microsoft Word?files[15]</summary>
public const string ApplicationMsword = "application/msword";
///<summary>MIME?Email; Defined in?RFC 2045?and?RFC 2046</summary>
public const string MultipartAlternative = "multipart/alternative";
///<summary>MIME?Email; Defined in?RFC 2045?and?RFC 2046</summary>
public const string MultipartMixed = "multipart/mixed";
///<summary>MIME?Email; Defined in?RFC 2387?and used by?MHTML?(HTML mail)</summary>
public const string MultipartRelated = "multipart/related";
///<summary>MIME?Webform; Defined in?RFC 2388</summary>
public const string MultipartFormData = "multipart/form-data";
/// <summary>Body contains a URL-encoded query string as per RFC 1867</summary>
public const string ApplicationWwwFormUrlEncoded = "application/x-www-form-urlencoded";
///<summary>Mozilla?XUL?files</summary>
public const string ApplicationVndMozillaXulXml = "application/vnd.mozilla.xul+xml";
///<summary>MP3?or other?MPEG?audio; Defined in?RFC 3003</summary>
public const string AudioMpeg = "audio/mpeg";
///<summary>MP4?audio</summary>
public const string AudioMp4 = "audio/mp4";
///<summary>MP4?video; Defined in?RFC 4337</summary>
public const string VideoMp4 = "video/mp4";
///<summary>MPEG-1?video with multiplexed audio; Defined in?RFC 2045?and?RFC 2046</summary>
public const string VideoMpeg = "video/mpeg";
///<summary>MSH files, MESH files; Defined in?RFC 2077, SILO files</summary>
public const string ModelMesh = "model/mesh";
///<summary>mulaw?audio at 8?kHz, 1 channel; Defined in?RFC 2046</summary>
public const string AudioBasic = "audio/basic";
///<summary>Ogg?Theora?or other video (with audio); Defined in?RFC 5334</summary>
public const string VideoOgg = "video/ogg";
///<summary>Ogg?Vorbis,?Speex,?Flac?and other audio; Defined in?RFC 5334</summary>
public const string AudioOgg = "audio/ogg";
///<summary>Ogg, a multimedia bitstream?container format; Defined in?RFC 5334</summary>
public const string ApplicationOgg = "application/ogg";
///<summary>OP</summary>
public const string ApplicationXopXml = "application/xop+xml";
///<summary>OpenDocument?Graphics; Registered[14]</summary>
public const string ApplicationVndOasisOpendocumentGraphics = "application/vnd.oasis.opendocument.graphics";
///<summary>OpenDocument?Presentation; Registered[13]</summary>
public const string ApplicationVndOasisOpendocumentPresentation = "application/vnd.oasis.opendocument.presentation";
///<summary>OpenDocument?Spreadsheet; Registered[12]</summary>
public const string ApplicationVndOasisOpendocumentSpreadsheet = "application/vnd.oasis.opendocument.spreadsheet";
///<summary>OpenDocument?Text; Registered[11]</summary>
public const string ApplicationVndOasisOpendocumentText = "application/vnd.oasis.opendocument.text";
///<summary>p12 files</summary>
public const string ApplicationXPkcs12 = "application/x-pkcs12";
///<summary>p7b and spc files</summary>
public const string ApplicationXPkcs7Certificates = "application/x-pkcs7-certificates";
///<summary>p7c files</summary>
public const string ApplicationXPkcs7Mime = "application/x-pkcs7-mime";
///<summary>p7r files</summary>
public const string ApplicationXPkcs7Certreqresp = "application/x-pkcs7-certreqresp";
///<summary>p7s files</summary>
public const string ApplicationXPkcs7Signature = "application/x-pkcs7-signature";
///<summary>Portable Document Format,?PDF?has been in use for document exchange on the Internet since 1993; Defined in?RFC 3778</summary>
public const string ApplicationPdf = "application/pdf
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