MIME types in C#
Oct 26 2009 ยท .NET Platform
The .NET Framework has no methods to get the MIME type of a file and, as I was in need of such functionality a while back, I’m glad I found this post on CSharpFriends.com (UPDATE: removed link, CSharpFriends.com is dead) which presents a switch statement that maps numerous filename extensions to the appropiate MIME type.
I was somewhat dismayed that someone mentioned using the system registry to lookup the MIME types, and the OP seemed to have gone with this method. Using the registry cuts down your codebase, but that’s little more than a convenience; there are some important issues that pop up when using the registry in this situation:
- It only works if the file extension is known to Windows; either the version of Windows the app is running on knows of the file extension or an application puts the file extension into the registry.
- It binds (read: couples) your app to a third-party component, in a situation where there is no need to.
- It locks you into a specific platform (i.e. it won’t work with Mono). Even if it’s not a major issue, there’s no reason to lock your app to a certain platform when you don’t have to.
UPDATE: As CSharpFriends.com is dead, the code I derived from the original post is below. The FromFileName() function will take a filepath, get the extension from the filename, and return the MIME type of the file.
static public string FromFileName(string filepath)
{
switch (System.IO.Path.GetExtension(filepath).ToLower())
{
case ".3dm": retval = "x-world/x-3dmf"; break;
case ".3dmf": retval = "x-world/x-3dmf"; break;
case ".a": retval = "application/octet-stream"; break;
case ".aab": retval = "application/x-authorware-bin"; break;
case ".aam": retval = "application/x-authorware-map"; break;
case ".aas": retval = "application/x-authorware-seg"; break;
case ".abc": retval = "text/vnd.abc"; break;
case ".acgi": retval = "text/html"; break;
case ".afl": retval = "video/animaflex"; break;
case ".ai": retval = "application/postscript"; break;
case ".aif": retval = "audio/aiff"; break;
case ".aifc": retval = "audio/aiff"; break;
case ".aiff": retval = "audio/aiff"; break;
case ".aim": retval = "application/x-aim"; break;
case ".aip": retval = "text/x-audiosoft-intra"; break;
case ".ani": retval = "application/x-navi-animation"; break;
case ".aos": retval = "application/x-nokia-9000-communicator-add-on-software"; break;
case ".aps": retval = "application/mime"; break;
case ".arc": retval = "application/octet-stream"; break;
case ".arj": retval = "application/arj"; break;
case ".art": retval = "image/x-jg"; break;
case ".asf": retval = "video/x-ms-asf"; break;
case ".asm": retval = "text/x-asm"; break;
case ".asp": retval = "text/asp"; break;
case ".asx": retval = "video/x-ms-asf"; break;
case ".au": retval = "audio/basic"; break;
case ".avi": retval = "video/avi"; break;
case ".avs": retval = "video/avs-video"; break;
case ".bcpio": retval = "application/x-bcpio"; break;
case ".bin": retval = "application/octet-stream"; break;
case ".bm": retval = "image/bmp"; break;
case ".bmp": retval = "image/bmp"; break;
case ".boo": retval = "application/book"; break;
case ".book": retval = "application/book"; break;
case ".boz": retval = "application/x-bzip2"; break;
case ".bsh": retval = "application/x-bsh"; break;
case ".bz": retval = "application/x-bzip"; break;
case ".bz2": retval = "application/x-bzip2"; break;
case ".c": retval = "text/plain"; break;
case ".c++": retval = "text/plain"; break;
case ".cat": retval = "application/vnd.ms-pki.seccat"; break;
case ".cc": retval = "text/plain"; break;
case ".ccad": retval = "application/clariscad"; break;
case ".cco": retval = "application/x-cocoa"; break;
case ".cdf": retval = "application/cdf"; break;
case ".cer": retval = "application/pkix-cert"; break;
case ".cha": retval = "application/x-chat"; break;
case ".chat": retval = "application/x-chat"; break;
case ".class": retval = "application/java"; break;
case ".com": retval = "application/octet-stream"; break;
case ".conf": retval = "text/plain"; break;
case ".cpio": retval = "application/x-cpio"; break;
case ".cpp": retval = "text/x-c"; break;
case ".cpt": retval = "application/x-cpt"; break;
case ".crl": retval = "application/pkcs-crl"; break;
case ".crt": retval = "application/pkix-cert"; break;
case ".cs": retval = "text/x-csharp"; break;
case ".csh": retval = "application/x-csh"; break;
case ".css": retval = "text/css"; break;
case ".cxx": retval = "text/plain"; break;
case ".dcr": retval = "application/x-director"; break;
case ".deepv": retval = "application/x-deepv"; break;
case ".def": retval = "text/plain"; break;
case ".der": retval = "application/x-x509-ca-cert"; break;
case ".dif": retval = "video/x-dv"; break;
case ".dir": retval = "application/x-director"; break;
case ".dl": retval = "video/dl"; break;
case ".doc": retval = "application/msword"; break;
case ".docx": retval = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"; break;
case ".dot": retval = "application/msword"; break;
case ".dp": retval = "application/commonground"; break;
case ".drw": retval = "application/drafting"; break;
case ".dump": retval = "application/octet-stream"; break;
case ".dv": retval = "video/x-dv"; break;
case ".dvi": retval = "application/x-dvi"; break;
case ".dwf": retval = "model/vnd.dwf"; break;
case ".dwg": retval = "image/vnd.dwg"; break;
case ".dxf": retval = "image/vnd.dwg"; break;
case ".dxr": retval = "application/x-director"; break;
case ".el": retval = "text/x-script.elisp"; break;
case ".elc": retval = "application/x-elc"; break;
case ".env": retval = "application/x-envoy"; break;
case ".eps": retval = "application/postscript"; break;
case ".es": retval = "application/x-esrehber"; break;
case ".etx": retval = "text/x-setext"; break;
case ".evy": retval = "application/envoy"; break;
case ".exe": retval = "application/octet-stream"; break;
case ".f": retval = "text/plain"; break;
case ".f77": retval = "text/x-fortran"; break;
case ".f90": retval = "text/plain"; break;
case ".fdf": retval = "application/vnd.fdf"; break;
case ".fif": retval = "image/fif"; break;
case ".fli": retval = "video/fli"; break;
case ".flo": retval = "image/florian"; break;
case ".flx": retval = "text/vnd.fmi.flexstor"; break;
case ".fmf": retval = "video/x-atomic3d-feature"; break;
case ".for": retval = "text/x-fortran"; break;
case ".fpx": retval = "image/vnd.fpx"; break;
case ".frl": retval = "application/freeloader"; break;
case ".funk": retval = "audio/make"; break;
case ".g": retval = "text/plain"; break;
case ".g3": retval = "image/g3fax"; break;
case ".gif": retval = "image/gif"; break;
case ".gl": retval = "video/gl"; break;
case ".gsd": retval = "audio/x-gsm"; break;
case ".gsm": retval = "audio/x-gsm"; break;
case ".gsp": retval = "application/x-gsp"; break;
case ".gss": retval = "application/x-gss"; break;
case ".gtar": retval = "application/x-gtar"; break;
case ".gz": retval = "application/x-gzip"; break;
case ".gzip": retval = "application/x-gzip"; break;
case ".h": retval = "text/plain"; break;
case ".hdf": retval = "application/x-hdf"; break;
case ".help": retval = "application/x-helpfile"; break;
case ".hgl": retval = "application/vnd.hp-hpgl"; break;
case ".hh": retval = "text/plain"; break;
case ".hlb": retval = "text/x-script"; break;
case ".hlp": retval = "application/hlp"; break;
case ".hpg": retval = "application/vnd.hp-hpgl"; break;
case ".hpgl": retval = "application/vnd.hp-hpgl"; break;
case ".hqx": retval = "application/binhex"; break;
case ".hta": retval = "application/hta"; break;
case ".htc": retval = "text/x-component"; break;
case ".htm": retval = "text/html"; break;
case ".html": retval = "text/html"; break;
case ".htmls": retval = "text/html"; break;
case ".htt": retval = "text/webviewhtml"; break;
case ".htx": retval = "text/html"; break;
case ".ice": retval = "x-conference/x-cooltalk"; break;
case ".ico": retval = "image/x-icon"; break;
case ".idc": retval = "text/plain"; break;
case ".ief": retval = "image/ief"; break;
case ".iefs": retval = "image/ief"; break;
case ".iges": retval = "application/iges"; break;
case ".igs": retval = "application/iges"; break;
case ".ima": retval = "application/x-ima"; break;
case ".imap": retval = "application/x-httpd-imap"; break;
case ".inf": retval = "application/inf"; break;
case ".ins": retval = "application/x-internett-signup"; break;
case ".ip": retval = "application/x-ip2"; break;
case ".isu": retval = "video/x-isvideo"; break;
case ".it": retval = "audio/it"; break;
case ".iv": retval = "application/x-inventor"; break;
case ".ivr": retval = "i-world/i-vrml"; break;
case ".ivy": retval = "application/x-livescreen"; break;
case ".jam": retval = "audio/x-jam"; break;
case ".jav": retval = "text/plain"; break;
case ".java": retval = "text/plain"; break;
case ".jcm": retval = "application/x-java-commerce"; break;
case ".jfif": retval = "image/jpeg"; break;
case ".jfif-tbnl": retval = "image/jpeg"; break;
case ".jpe": retval = "image/jpeg"; break;
case ".jpeg": retval = "image/jpeg"; break;
case ".jpg": retval = "image/jpeg"; break;
case ".jps": retval = "image/x-jps"; break;
case ".js": retval = "application/x-javascript"; break;
case ".jut": retval = "image/jutvision"; break;
case ".kar": retval = "audio/midi"; break;
case ".ksh": retval = "application/x-ksh"; break;
case ".la": retval = "audio/nspaudio"; break;
case ".lam": retval = "audio/x-liveaudio"; break;
case ".latex": retval = "application/x-latex"; break;
case ".lha": retval = "application/octet-stream"; break;
case ".lhx": retval = "application/octet-stream"; break;
case ".list": retval = "text/plain"; break;
case ".lma": retval = "audio/nspaudio"; break;
case ".log": retval = "text/plain"; break;
case ".lsp": retval = "application/x-lisp"; break;
case ".lst": retval = "text/plain"; break;
case ".lsx": retval = "text/x-la-asf"; break;
case ".ltx": retval = "application/x-latex"; break;
case ".lzh": retval = "application/octet-stream"; break;
case ".lzx": retval = "application/octet-stream"; break;
case ".m": retval = "text/plain"; break;
case ".m1v": retval = "video/mpeg"; break;
case ".m2a": retval = "audio/mpeg"; break;
case ".m2v": retval = "video/mpeg"; break;
case ".m3u": retval = "audio/x-mpequrl"; break;
case ".man": retval = "application/x-troff-man"; break;
case ".map": retval = "application/x-navimap"; break;
case ".mar": retval = "text/plain"; break;
case ".mbd": retval = "application/mbedlet"; break;
case ".mc$": retval = "application/x-magic-cap-package-1.0"; break;
case ".mcd": retval = "application/mcad"; break;
case ".mcf": retval = "text/mcf"; break;
case ".mcp": retval = "application/netmc"; break;
case ".me": retval = "application/x-troff-me"; break;
case ".mht": retval = "message/rfc822"; break;
case ".mhtml": retval = "message/rfc822"; break;
case ".mid": retval = "audio/midi"; break;
case ".midi": retval = "audio/midi"; break;
case ".mif": retval = "application/x-mif"; break;
case ".mime": retval = "message/rfc822"; break;
case ".mjf": retval = "audio/x-vnd.audioexplosion.mjuicemediafile"; break;
case ".mjpg": retval = "video/x-motion-jpeg"; break;
case ".mm": retval = "application/base64"; break;
case ".mme": retval = "application/base64"; break;
case ".mod": retval = "audio/mod"; break;
case ".moov": retval = "video/quicktime"; break;
case ".mov": retval = "video/quicktime"; break;
case ".movie": retval = "video/x-sgi-movie"; break;
case ".mp2": retval = "audio/mpeg"; break;
case ".mp3": retval = "audio/mpeg"; break;
case ".mpa": retval = "audio/mpeg"; break;
case ".mpc": retval = "application/x-project"; break;
case ".mpe": retval = "video/mpeg"; break;
case ".mpeg": retval = "video/mpeg"; break;
case ".mpg": retval = "video/mpeg"; break;
case ".mpga": retval = "audio/mpeg"; break;
case ".mpp": retval = "application/vnd.ms-project"; break;
case ".mpt": retval = "application/vnd.ms-project"; break;
case ".mpv": retval = "application/vnd.ms-project"; break;
case ".mpx": retval = "application/vnd.ms-project"; break;
case ".mrc": retval = "application/marc"; break;
case ".ms": retval = "application/x-troff-ms"; break;
case ".mv": retval = "video/x-sgi-movie"; break;
case ".my": retval = "audio/make"; break;
case ".mzz": retval = "application/x-vnd.audioexplosion.mzz"; break;
case ".nap": retval = "image/naplps"; break;
case ".naplps": retval = "image/naplps"; break;
case ".nc": retval = "application/x-netcdf"; break;
case ".ncm": retval = "application/vnd.nokia.configuration-message"; break;
case ".nif": retval = "image/x-niff"; break;
case ".niff": retval = "image/x-niff"; break;
case ".nix": retval = "application/x-mix-transfer"; break;
case ".nsc": retval = "application/x-conference"; break;
case ".nvd": retval = "application/x-navidoc"; break;
case ".o": retval = "application/octet-stream"; break;
case ".oda": retval = "application/oda"; break;
case ".ogg": retval = "audio/ogg"; break;
case ".omc": retval = "application/x-omc"; break;
case ".omcd": retval = "application/x-omcdatamaker"; break;
case ".omcr": retval = "application/x-omcregerator"; break;
case ".p": retval = "text/x-pascal"; break;
case ".p10": retval = "application/pkcs10"; break;
case ".p12": retval = "application/pkcs-12"; break;
case ".p7a": retval = "application/x-pkcs7-signature"; break;
case ".p7c": retval = "application/pkcs7-mime"; break;
case ".p7m": retval = "application/pkcs7-mime"; break;
case ".p7r": retval = "application/x-pkcs7-certreqresp"; break;
case ".p7s": retval = "application/pkcs7-signature"; break;
case ".part": retval = "application/pro_eng"; break;
case ".pas": retval = "text/pascal"; break;
case ".pbm": retval = "image/x-portable-bitmap"; break;
case ".pcl": retval = "application/vnd.hp-pcl"; break;
case ".pct": retval = "image/x-pict"; break;
case ".pcx": retval = "image/x-pcx"; break;
case ".pdb": retval = "chemical/x-pdb"; break;
case ".pdf": retval = "application/pdf"; break;
case ".pfunk": retval = "audio/make"; break;
case ".pgm": retval = "image/x-portable-greymap"; break;
case ".php": retval = "text/php"; break;
case ".pic": retval = "image/pict"; break;
case ".pict": retval = "image/pict"; break;
case ".pkg": retval = "application/x-newton-compatible-pkg"; break;
case ".pko": retval = "application/vnd.ms-pki.pko"; break;
case ".pl": retval = "text/plain"; break;
case ".plx": retval = "application/x-pixclscript"; break;
case ".pm": retval = "image/x-xpixmap"; break;
case ".pm4": retval = "application/x-pagemaker"; break;
case ".pm5": retval = "application/x-pagemaker"; break;
case ".png": retval = "image/png"; break;
case ".pnm": retval = "application/x-portable-anymap"; break;
case ".pot": retval = "application/vnd.ms-powerpoint"; break;
case ".pov": retval = "model/x-pov"; break;
case ".ppa": retval = "application/vnd.ms-powerpoint"; break;
case ".ppm": retval = "image/x-portable-pixmap"; break;
case ".pps": retval = "application/vnd.ms-powerpoint"; break;
case ".ppt": retval = "application/vnd.ms-powerpoint"; break;
case ".pptx": retval = "application/vnd.openxmlformats-officedocument.presentationml.presentation"; break;
case ".ppz": retval = "application/vnd.ms-powerpoint"; break;
case ".pre": retval = "application/x-freelance"; break;
case ".prt": retval = "application/pro_eng"; break;
case ".ps": retval = "application/postscript"; break;
case ".psd": retval = "image/vnd.adobe.photoshop"; break;
case ".pvu": retval = "paleovu/x-pv"; break;
case ".pwz": retval = "application/vnd.ms-powerpoint"; break;
case ".py": retval = "text/x-script.phyton"; break;
case ".pyc": retval = "applicaiton/x-bytecode.python"; break;
case ".qcp": retval = "audio/vnd.qcelp"; break;
case ".qd3": retval = "x-world/x-3dmf"; break;
case ".qd3d": retval = "x-world/x-3dmf"; break;
case ".qif": retval = "image/x-quicktime"; break;
case ".qt": retval = "video/quicktime"; break;
case ".qtc": retval = "video/x-qtc"; break;
case ".qti": retval = "image/x-quicktime"; break;
case ".qtif": retval = "image/x-quicktime"; break;
case ".ra": retval = "audio/x-pn-realaudio"; break;
case ".ram": retval = "audio/x-pn-realaudio"; break;
case ".ras": retval = "application/x-cmu-raster"; break;
case ".rast": retval = "image/cmu-raster"; break;
case ".rexx": retval = "text/x-script.rexx"; break;
case ".rf": retval = "image/vnd.rn-realflash"; break;
case ".rgb": retval = "image/x-rgb"; break;
case ".rm": retval = "application/vnd.rn-realmedia"; break;
case ".rmi": retval = "audio/mid"; break;
case ".rmm": retval = "audio/x-pn-realaudio"; break;
case ".rmp": retval = "audio/x-pn-realaudio"; break;
case ".rng": retval = "application/ringing-tones"; break;
case ".rnx": retval = "application/vnd.rn-realplayer"; break;
case ".roff": retval = "application/x-troff"; break;
case ".rp": retval = "image/vnd.rn-realpix"; break;
case ".rpm": retval = "audio/x-pn-realaudio-plugin"; break;
case ".rt": retval = "text/richtext"; break;
case ".rtf": retval = "text/richtext"; break;
case ".rtx": retval = "text/richtext"; break;
case ".rv": retval = "video/vnd.rn-realvideo"; break;
case ".s": retval = "text/x-asm"; break;
case ".s3m": retval = "audio/s3m"; break;
case ".saveme": retval = "application/octet-stream"; break;
case ".sbk": retval = "application/x-tbook"; break;
case ".scm": retval = "application/x-lotusscreencam"; break;
case ".sdml": retval = "text/plain"; break;
case ".sdp": retval = "application/sdp"; break;
case ".sdr": retval = "application/sounder"; break;
case ".sea": retval = "application/sea"; break;
case ".set": retval = "application/set"; break;
case ".sgm": retval = "text/sgml"; break;
case ".sgml": retval = "text/sgml"; break;
case ".sh": retval = "application/x-sh"; break;
case ".shar": retval = "application/x-shar"; break;
case ".shtml": retval = "text/html"; break;
case ".sid": retval = "audio/x-psid"; break;
case ".sit": retval = "application/x-sit"; break;
case ".skd": retval = "application/x-koan"; break;
case ".skm": retval = "application/x-koan"; break;
case ".skp": retval = "application/x-koan"; break;
case ".skt": retval = "application/x-koan"; break;
case ".sl": retval = "application/x-seelogo"; break;
case ".smi": retval = "application/smil"; break;
case ".smil": retval = "application/smil"; break;
case ".snd": retval = "audio/basic"; break;
case ".sol": retval = "application/solids"; break;
case ".spc": retval = "text/x-speech"; break;
case ".spl": retval = "application/futuresplash"; break;
case ".spr": retval = "application/x-sprite"; break;
case ".sprite": retval = "application/x-sprite"; break;
case ".src": retval = "application/x-wais-source"; break;
case ".ssi": retval = "text/x-server-parsed-html"; break;
case ".ssm": retval = "application/streamingmedia"; break;
case ".sst": retval = "application/vnd.ms-pki.certstore"; break;
case ".step": retval = "application/step"; break;
case ".stl": retval = "application/sla"; break;
case ".stp": retval = "application/step"; break;
case ".sv4cpio": retval = "application/x-sv4cpio"; break;
case ".sv4crc": retval = "application/x-sv4crc"; break;
case ".svf": retval = "image/vnd.dwg"; break;
case ".svr": retval = "application/x-world"; break;
case ".swf": retval = "application/x-shockwave-flash"; break;
case ".t": retval = "application/x-troff"; break;
case ".talk": retval = "text/x-speech"; break;
case ".tar": retval = "application/x-tar"; break;
case ".tbk": retval = "application/toolbook"; break;
case ".tcl": retval = "application/x-tcl"; break;
case ".tcsh": retval = "text/x-script.tcsh"; break;
case ".tex": retval = "application/x-tex"; break;
case ".texi": retval = "application/x-texinfo"; break;
case ".texinfo": retval = "application/x-texinfo"; break;
case ".text": retval = "text/plain"; break;
case ".tgz": retval = "application/x-compressed"; break;
case ".tif": retval = "image/tiff"; break;
case ".tiff": retval = "image/tiff"; break;
case ".tr": retval = "application/x-troff"; break;
case ".tsi": retval = "audio/tsp-audio"; break;
case ".tsp": retval = "application/dsptype"; break;
case ".tsv": retval = "text/tab-separated-values"; break;
case ".turbot": retval = "image/florian"; break;
case ".txt": retval = "text/plain"; break;
case ".uil": retval = "text/x-uil"; break;
case ".uni": retval = "text/uri-list"; break;
case ".unis": retval = "text/uri-list"; break;
case ".unv": retval = "application/i-deas"; break;
case ".uri": retval = "text/uri-list"; break;
case ".uris": retval = "text/uri-list"; break;
case ".url": retval = "text/url"; break;
case ".ustar": retval = "application/x-ustar"; break;
case ".uu": retval = "application/octet-stream"; break;
case ".uue": retval = "text/x-uuencode"; break;
case ".vcd": retval = "application/x-cdlink"; break;
case ".vcs": retval = "text/x-vcalendar"; break;
case ".vda": retval = "application/vda"; break;
case ".vdo": retval = "video/vdo"; break;
case ".vew": retval = "application/groupwise"; break;
case ".viv": retval = "video/vivo"; break;
case ".vivo": retval = "video/vivo"; break;
case ".vmd": retval = "application/vocaltec-media-desc"; break;
case ".vmf": retval = "application/vocaltec-media-file"; break;
case ".voc": retval = "audio/voc"; break;
case ".vos": retval = "video/vosaic"; break;
case ".vox": retval = "audio/voxware"; break;
case ".vqe": retval = "audio/x-twinvq-plugin"; break;
case ".vqf": retval = "audio/x-twinvq"; break;
case ".vql": retval = "audio/x-twinvq-plugin"; break;
case ".vrml": retval = "application/x-vrml"; break;
case ".vrt": retval = "x-world/x-vrt"; break;
case ".vsd": retval = "application/x-visio"; break;
case ".vst": retval = "application/x-visio"; break;
case ".vsw": retval = "application/x-visio"; break;
case ".w60": retval = "application/wordperfect6.0"; break;
case ".w61": retval = "application/wordperfect6.1"; break;
case ".w6w": retval = "application/msword"; break;
case ".wav": retval = "audio/wav"; break;
case ".wb1": retval = "application/x-qpro"; break;
case ".wbmp": retval = "image/vnd.wap.wbmp"; break;
case ".web": retval = "application/vnd.xara"; break;
case ".wiz": retval = "application/msword"; break;
case ".wk1": retval = "application/x-123"; break;
case ".wmf": retval = "windows/metafile"; break;
case ".wml": retval = "text/vnd.wap.wml"; break;
case ".wmlc": retval = "application/vnd.wap.wmlc"; break;
case ".wmls": retval = "text/vnd.wap.wmlscript"; break;
case ".wmlsc": retval = "application/vnd.wap.wmlscriptc"; break;
case ".word": retval = "application/msword"; break;
case ".wmv": retval = "video/x-ms-wmv"; break;
case ".wp": retval = "application/wordperfect"; break;
case ".wp5": retval = "application/wordperfect"; break;
case ".wp6": retval = "application/wordperfect"; break;
case ".wpd": retval = "application/wordperfect"; break;
case ".wq1": retval = "application/x-lotus"; break;
case ".wri": retval = "application/mswrite"; break;
case ".wrl": retval = "application/x-world"; break;
case ".wrz": retval = "x-world/x-vrml"; break;
case ".wsc": retval = "text/scriplet"; break;
case ".wsrc": retval = "application/x-wais-source"; break;
case ".wtk": retval = "application/x-wintalk"; break;
case ".xbm": retval = "image/x-xbitmap"; break;
case ".xdr": retval = "video/x-amt-demorun"; break;
case ".xgz": retval = "xgl/drawing"; break;
case ".xif": retval = "image/vnd.xiff"; break;
case ".xl": retval = "application/excel"; break;
case ".xla": retval = "application/vnd.ms-excel"; break;
case ".xlb": retval = "application/vnd.ms-excel"; break;
case ".xlc": retval = "application/vnd.ms-excel"; break;
case ".xld": retval = "application/vnd.ms-excel"; break;
case ".xlk": retval = "application/vnd.ms-excel"; break;
case ".xll": retval = "application/vnd.ms-excel"; break;
case ".xlm": retval = "application/vnd.ms-excel"; break;
case ".xls": retval = "application/vnd.ms-excel"; break;
case ".xlsx": retval = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; break;
case ".xlt": retval = "application/vnd.ms-excel"; break;
case ".xlv": retval = "application/vnd.ms-excel"; break;
case ".xlw": retval = "application/vnd.ms-excel"; break;
case ".xm": retval = "audio/xm"; break;
case ".xml": retval = "application/xml"; break;
case ".xmz": retval = "xgl/movie"; break;
case ".xpix": retval = "application/x-vnd.ls-xpix"; break;
case ".xpm": retval = "image/xpm"; break;
case ".x-png": retval = "image/png"; break;
case ".xsr": retval = "video/x-amt-showrun"; break;
case ".xwd": retval = "image/x-xwd"; break;
case ".xyz": retval = "chemical/x-pdb"; break;
case ".z": retval = "application/x-compressed"; break;
case ".zip": retval = "application/zip"; break;
case ".zoo": retval = "application/octet-stream"; break;
case ".zsh": retval = "text/x-script.zsh"; break;
default: retval = "application/octet-stream"; break;
}
return retval;
}
