一、linux系统的虚拟主机，这个无法在控制面板操作，需要编辑伪静态规则文件才可以

　　1、找到.htaccess (FTP设置显示隐藏文件可以参考 http://help.aliyun.com/knowledge_detail/6555026.html

　　2、在本地编辑.htaccess文件添加的规则如下(这里举例是mp4a，支持添加多条)

　　AddHandler audio/mp4 .m4a

　　二、windows系统的虚拟主机，这个是比较人性化的设置，直接在控制面板就可以添加系统支持的MIME类型

　　操作的方式：

　　登录万网用户中心--我的主机--> 管理--进入控制面板--高级环境设置--MIME类型设置(这个类型如不知道，请关注文章的结尾给出一个常用的类型介绍)

　　比如添加 .pdf : 第一个方框填写(文件类型：) .mp4 第二个(应用程序：)写application/pdf //如果不填写错误文件就一直无法显示

　　三、常用MIME类型介绍

　　格式前面为后辍名，后面为对应的MIME型(例如：rar application/x-rar-compressed 表示。RAR对应的是application/x-rar-compressed )

　　{ ".323", "text/h323" },

　　{ ".3gp", "video/3gpp" },

　　{ ".aab", "application/x-authoware-bin" },

　　{ ".aam", "application/x-authoware-map" },

　　{ ".aas", "application/x-authoware-seg" },

　　{ ".acx", "application/internet-property-stream" },

　　{ ".ai", "application/postscript" },

　　{ ".aif", "audio/x-aiff" },

　　{ ".aifc", "audio/x-aiff" },

　　{ ".aiff", "audio/x-aiff" },

　　{ ".als", "audio/X-Alpha5" },

　　{ ".amc", "application/x-mpeg" },

　　{ ".ani", "application/octet-stream" },

　　{ ".apk", "application/vnd.android.package-archive" },

　　{ ".asc", "text/plain" },

　　{ ".asd", "application/astound" },

　　{ ".asf", "video/x-ms-asf" },

　　{ ".asn", "application/astound" },

　　{ ".asp", "application/x-asap" },

　　{ ".asr", "video/x-ms-asf" },

　　{ ".asx", "video/x-ms-asf" },

　　{ ".au", "audio/basic" },

　　{ ".avb", "application/octet-stream" },

　　{ ".avi", "video/x-msvideo" },

　　{ ".awb", "audio/amr-wb" },

　　{ ".axs", "application/olescript" },

　　{ ".bas", "text/plain" },

　　{ ".bcpio", "application/x-bcpio" },

　　{ ".bin ", "application/octet-stream" },

　　{ ".bld", "application/bld" },

　　{ ".bld2", "application/bld2" },

　　{ ".bmp", "image/bmp" },

　　{ ".bpk", "application/octet-stream" },

　　{ ".bz2", "application/x-bzip2" },

　　{ ".c", "text/plain" },

　　{ ".cal", "image/x-cals" },

　　{ ".cat", "application/vnd.ms-pkiseccat" },

　　{ ".ccn", "application/x-cnc" },

　　{ ".cco", "application/x-cocoa" },

　　{ ".cdf", "application/x-cdf" },

　　{ ".cer", "application/x-x509-ca-cert" },

　　{ ".cgi", "magnus-internal/cgi" },

　　{ ".chat", "application/x-chat" },

　　{ ".class", "application/octet-stream" },

　　{ ".clp", "application/x-msclip" },

　　{ ".cmx", "image/x-cmx" },

　　{ ".co", "application/x-cult3d-object" },

　　{ ".cod", "image/cis-cod" },

　　{ ".conf", "text/plain" },

　　{ ".cpio", "application/x-cpio" },

　　{ ".cpp", "text/plain" },

　　{ ".cpt", "application/mac-compactpro" },

　　{ ".crd", "application/x-mscardfile" },

　　{ ".crl", "application/pkix-crl" },

　　{ ".crt", "application/x-x509-ca-cert" },

　　{ ".csh", "application/x-csh" },

　　{ ".csm", "chemical/x-csml" },

　　{ ".csml", "chemical/x-csml" },

　　{ ".css", "text/css" },

　　{ ".cur", "application/octet-stream" },

　　{ ".dcm", "x-lml/x-evm" },

　　{ ".dcr", "application/x-director" },

　　{ ".dcx", "image/x-dcx" },

　　{ ".der", "application/x-x509-ca-cert" },

　　{ ".dhtml", "text/html" },

　　{ ".dir", "application/x-director" },

　　{ ".dll", "application/x-msdownload" },

　　{ ".dmg", "application/octet-stream" },

　　{ ".dms", "application/octet-stream" },

　　{ ".doc", "application/msword" },

　　{ ".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document" },

　　{ ".dot", "application/msword" },

　　{ ".dvi", "application/x-dvi" },

　　{ ".dwf", "drawing/x-dwf" },

　　{ ".dwg", "application/x-autocad" },

　　{ ".dxf", "application/x-autocad" },

　　{ ".dxr", "application/x-director" },

　　{ ".ebk", "application/x-expandedbook" },

　　{ ".emb", "chemical/x-embl-dl-nucleotide" },

　　{ ".embl", "chemical/x-embl-dl-nucleotide" },

　　{ ".eps", "application/postscript" },

　　{ ".epub", "application/epub+zip" },

　　{ ".eri", "image/x-eri" },

　　{ ".es", "audio/echospeech" },

　　{ ".esl", "audio/echospeech" },

　　{ ".etc", "application/x-earthtime" },

　　{ ".etx", "text/x-setext" },

　　{ ".evm", "x-lml/x-evm" },

　　{ ".evy", "application/envoy" },

　　{ ".exe", "application/octet-stream" },

　　{ ".fh4", "image/x-freehand" },

　　{ ".fh5", "image/x-freehand" },

　　{ ".fhc", "image/x-freehand" },

　　{ ".fif", "application/fractals" },

　　{ ".flr", "x-world/x-vrml" },

　　{ ".flv", "flv-application/octet-stream" },

　　{ ".fm", "application/x-maker" },

　　{ ".fpx", "image/x-fpx" },

　　{ ".fvi", "video/isivideo" },

　　{ ".gau", "chemical/x-gaussian-input" },

　　{ ".gca", "application/x-gca-compressed" },

　　{ ".gdb", "x-lml/x-gdb" },

　　{ ".gif", "image/gif" },

　　{ ".gps", "application/x-gps" },

　　{ ".gtar", "application/x-gtar" },

　　{ ".gz", "application/x-gzip" },

　　{ ".h", "text/plain" },

　　{ ".hdf", "application/x-hdf" },

　　{ ".hdm", "text/x-hdml" },

　　{ ".hdml", "text/x-hdml" },

　　{ ".hlp", "application/winhlp" },

　　{ ".hqx", "application/mac-binhex40" },

　　{ ".hta", "application/hta" },

　　{ ".htc", "text/x-component" },

　　{ ".htm", "text/html" },

　　{ ".html", "text/html" },

　　{ ".hts", "text/html" },

　　{ ".htt", "text/webviewhtml" },

　　{ ".ice", "x-conference/x-cooltalk" },

　　{ ".ico", "image/x-icon" },

　　{ ".ief", "image/ief" },

　　{ ".ifm", "image/gif" },

　　{ ".ifs", "image/ifs" },

　　{ ".iii", "application/x-iphone" },

　　{ ".imy", "audio/melody" },

　　{ ".ins", "application/x-internet-signup" },

　　{ ".ips", "application/x-ipscript" },

　　{ ".ipx", "application/x-ipix" },

　　{ ".isp", "application/x-internet-signup" },

　　{ ".it", "audio/x-mod" },

　　{ ".itz", "audio/x-mod" },

　　{ ".ivr", "i-world/i-vrml" },

　　{ ".j2k", "image/j2k" },

　　{ ".jad", "text/vnd.sun.j2me.app-descriptor" },

　　{ ".jam", "application/x-jam" },

　　{ ".jar", "application/java-archive" },

　　{ ".java", "text/plain" },

　　{ ".jfif", "image/pipeg" },

　　{ ".jnlp", "application/x-java-jnlp-file" },

　　{ ".jpe", "image/jpeg" },

　　{ ".jpeg", "image/jpeg" },

　　{ ".jpg", "image/jpeg" },

　　{ ".jpz", "image/jpeg" },

　　{ ".js", "application/x-javascript" },

　　{ ".jwc", "application/jwc" },

　　{ ".kjx", "application/x-kjx" },

　　{ ".lak", "x-lml/x-lak" },

　　{ ".latex", "application/x-latex" },

　　{ ".lcc", "application/fastman" },

　　{ ".lcl", "application/x-digitalloca" },

　　{ ".lcr", "application/x-digitalloca" },

　　{ ".lgh", "application/lgh" },

　　{ ".lha", "application/octet-stream" },

　　{ ".lml", "x-lml/x-lml" },

　　{ ".lmlpack", "x-lml/x-lmlpack" },

　　{ ".log", "text/plain" },

　　{ ".lsf", "video/x-la-asf" },

　　{ ".lsx", "video/x-la-asf" },

　　{ ".lzh", "application/octet-stream" },

　　{ ".m13", "application/x-msmediaview" },

　　{ ".m14", "application/x-msmediaview" },

　　{ ".m15", "audio/x-mod" },

　　{ ".m3u", "audio/x-mpegurl" },

　　{ ".m3url", "audio/x-mpegurl" },

　　{ ".m4a", "audio/mp4a-latm" },

　　{ ".m4b", "audio/mp4a-latm" },

　　{ ".m4p", "audio/mp4a-latm" },

　　{ ".m4u", "video/vnd.mpegurl" },

　　{ ".m4v", "video/x-m4v" },

　　{ ".ma1", "audio/ma1" },

　　{ ".ma2", "audio/ma2" },

　　{ ".ma3", "audio/ma3" },

　　{ ".ma5", "audio/ma5" },

　　{ ".man", "application/x-troff-man" },

　　{ ".map", "magnus-internal/imagemap" },

　　{ ".mbd", "application/mbedlet" },

　　{ ".mct", "application/x-mascot" },

　　{ ".mdb", "application/x-msaccess" },

　　{ ".mdz", "audio/x-mod" },

　　{ ".me", "application/x-troff-me" },

　　{ ".mel", "text/x-vmel" },

　　{ ".mht", "message/rfc822" },

　　{ ".mhtml", "message/rfc822" },

　　{ ".mi", "application/x-mif" },

　　{ ".mid", "audio/mid" },

　　{ ".midi", "audio/midi" },

　　{ ".mif", "application/x-mif" },

　　{ ".mil", "image/x-cals" },

　　{ ".mio", "audio/x-mio" },

　　{ ".mmf", "application/x-skt-lbs" },

　　{ ".mng", "video/x-mng" },

　　{ ".mny", "application/x-msmoney" },

　　{ ".moc", "application/x-mocha" },

　　{ ".mocha", "application/x-mocha" },

　　{ ".mod", "audio/x-mod" },

　　{ ".mof", "application/x-yumekara" },

　　{ ".mol", "chemical/x-mdl-molfile" },

　　{ ".mop", "chemical/x-mopac-input" },

　　{ ".mov", "video/quicktime" },

　　{ ".movie", "video/x-sgi-movie" },

　　{ ".mp2", "video/mpeg" },

　　{ ".mp3", "audio/mpeg" },

　　{ ".mp4", "video/mp4" },

　　{ ".mpa", "video/mpeg" },

　　{ ".mpc", "application/vnd.mpohun.certificate" },

　　{ ".mpe", "video/mpeg" },

　　{ ".mpeg", "video/mpeg" },

　　{ ".mpg", "video/mpeg" },

　　{ ".mpg4", "video/mp4" },

　　{ ".mpga", "audio/mpeg" },

　　{ ".mpn", "application/vnd.mophun.application" },

　　{ ".mpp", "application/vnd.ms-project" },

　　{ ".mps", "application/x-mapserver" },

　　{ ".mpv2", "video/mpeg" },

　　{ ".mrl", "text/x-mrml" },

　　{ ".mrm", "application/x-mrm" },

　　{ ".ms", "application/x-troff-ms" },

　　{ ".msg", "application/vnd.ms-outlook" },

　　{ ".mts", "application/metastream" },

　　{ ".mtx", "application/metastream" },

　　{ ".mtz", "application/metastream" },

　　{ ".mvb", "application/x-msmediaview" },

　　{ ".mzv", "application/metastream" },

　　{ ".nar", "application/zip" },

　　{ ".nbmp", "image/nbmp" },

　　{ ".nc", "application/x-netcdf" },

　　{ ".ndb", "x-lml/x-ndb" },

　　{ ".ndwn", "application/ndwn" },

　　{ ".nif", "application/x-nif" },

　　{ ".nmz", "application/x-scream" },

　　{ ".nokia-op-logo", "image/vnd.nok-oplogo-color" },

　　{ ".npx", "application/x-netfpx" },

　　{ ".nsnd", "audio/nsnd" },

　　{ ".nva", "application/x-neva1" },

　　{ ".nws", "message/rfc822" },

　　{ ".oda", "application/oda" },

　　{ ".ogg", "audio/ogg" },

　　{ ".oom", "application/x-AtlasMate-Plugin" },

　　{ ".p10", "application/pkcs10" },

　　{ ".p12", "application/x-pkcs12" },

　　{ ".p7b", "application/x-pkcs7-certificates" },

　　{ ".p7c", "application/x-pkcs7-mime" },

　　{ ".p7m", "application/x-pkcs7-mime" },

　　{ ".p7r", "application/x-pkcs7-certreqresp" },

　　{ ".p7s", "application/x-pkcs7-signature" },

　　{ ".pac", "audio/x-pac" },

　　{ ".pae", "audio/x-epac" },

　　{ ".pan", "application/x-pan" },

　　{ ".pbm", "image/x-portable-bitmap" },

　　{ ".pcx", "image/x-pcx" },

　　{ ".pda", "image/x-pda" },

　　{ ".pdb", "chemical/x-pdb" },

　　{ ".pdf", "application/pdf" },

　　{ ".pfr", "application/font-tdpfr" },

　　{ ".pfx", "application/x-pkcs12" },

　　{ ".pgm", "image/x-portable-graymap" },

　　{ ".pict", "image/x-pict" },

　　{ ".pko", "application/ynd.ms-pkipko" },

　　{ ".pm", "application/x-perl" },

　　{ ".pma", "application/x-perfmon" },

　　{ ".pmc", "application/x-perfmon" },

　　{ ".pmd", "application/x-pmd" },

　　{ ".pml", "application/x-perfmon" },

　　{ ".pmr", "application/x-perfmon" },

　　{ ".pmw", "application/x-perfmon" },

　　{ ".png", "image/png" },

　　{ ".pnm", "image/x-portable-anymap" },

　　{ ".pnz", "image/png" },

　　{ ".pot,", "application/vnd.ms-powerpoint" },

　　{ ".ppm", "image/x-portable-pixmap" },

　　{ ".pps", "application/vnd.ms-powerpoint" },

　　{ ".ppt", "application/vnd.ms-powerpoint" },

　　{ ".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation" },

　　{ ".pqf", "application/x-cprplayer" },

　　{ ".pqi", "application/cprplayer" },

　　{ ".prc", "application/x-prc" },

　　{ ".prf", "application/pics-rules" },

　　{ ".prop", "text/plain" },

　　{ ".proxy", "application/x-ns-proxy-autoconfig" },

　　{ ".ps", "application/postscript" },

　　{ ".ptlk", "application/listenup" },

　　{ ".pub", "application/x-mspublisher" },

　　{ ".pvx", "video/x-pv-pvx" },

　　{ ".qcp", "audio/vnd.qcelp" },

　　{ ".qt", "video/quicktime" },

　　{ ".qti", "image/x-quicktime" },

　　{ ".qtif", "image/x-quicktime" },

　　{ ".r3t", "text/vnd.rn-realtext3d" },

　　{ ".ra", "audio/x-pn-realaudio" },

　　{ ".ram", "audio/x-pn-realaudio" },

　　{ ".rar", "application/octet-stream" },

　　{ ".ras", "image/x-cmu-raster" },

　　{ ".rc", "text/plain" },

　　{ ".rdf", "application/rdf+xml" },

　　{ ".rf", "image/vnd.rn-realflash" },

　　{ ".rgb", "image/x-rgb" },

　　{ ".rlf", "application/x-richlink" },

　　{ ".rm", "audio/x-pn-realaudio" },

　　{ ".rmf", "audio/x-rmf" },

　　{ ".rmi", "audio/mid" },

　　{ ".rmm", "audio/x-pn-realaudio" },

　　{ ".rmvb", "audio/x-pn-realaudio" },

　　{ ".rnx", "application/vnd.rn-realplayer" },

　　{ ".roff", "application/x-troff" },

　　{ ".rp", "image/vnd.rn-realpix" },

　　{ ".rpm", "audio/x-pn-realaudio-plugin" },

　　{ ".rt", "text/vnd.rn-realtext" },

　　{ ".rte", "x-lml/x-gps" },

　　{ ".rtf", "application/rtf" },

　　{ ".rtg", "application/metastream" },

　　{ ".rtx", "text/richtext" },

　　{ ".rv", "video/vnd.rn-realvideo" },

　　{ ".rwc", "application/x-rogerwilco" },

　　{ ".s3m", "audio/x-mod" },

　　{ ".s3z", "audio/x-mod" },

　　{ ".sca", "application/x-supercard" },

　　{ ".scd", "application/x-msschedule" },

　　{ ".sct", "text/scriptlet" },

　　{ ".sdf", "application/e-score" },

　　{ ".sea", "application/x-stuffit" },

　　{ ".setpay", "application/set-payment-initiation" },

　　{ ".setreg", "application/set-registration-initiation" },

　　{ ".sgm", "text/x-sgml" },

　　{ ".sgml", "text/x-sgml" },

　　{ ".sh", "application/x-sh" },

　　{ ".shar", "application/x-shar" },

　　{ ".shtml", "magnus-internal/parsed-html" },

　　{ ".shw", "application/presentations" },

　　{ ".si6", "image/si6" },

　　{ ".si7", "image/vnd.stiwap.sis" },

　　{ ".si9", "image/vnd.lgtwap.sis" },

　　{ ".sis", "application/vnd.symbian.install" },

　　{ ".sit", "application/x-stuffit" },

　　{ ".skd", "application/x-Koan" },

　　{ ".skm", "application/x-Koan" },

　　{ ".skp", "application/x-Koan" },

　　{ ".skt", "application/x-Koan" },

　　{ ".slc", "application/x-salsa" },

　　{ ".smd", "audio/x-smd" },

　　{ ".smi", "application/smil" },

　　{ ".smil", "application/smil" },

　　{ ".smp", "application/studiom" },

　　{ ".smz", "audio/x-smd" },

　　{ ".snd", "audio/basic" },

　　{ ".spc", "application/x-pkcs7-certificates" },

　　{ ".spl", "application/futuresplash" },

　　{ ".spr", "application/x-sprite" },

　　{ ".sprite", "application/x-sprite" },

　　{ ".sdp", "application/sdp" },

　　{ ".spt", "application/x-spt" },

　　{ ".src", "application/x-wais-source" },

　　{ ".sst", "application/vnd.ms-pkicertstore" },

　　{ ".stk", "application/hyperstudio" },

　　{ ".stl", "application/vnd.ms-pkistl" },

　　{ ".stm", "text/html" },

　　{ ".svg", "image/svg+xml" },

　　{ ".sv4cpio", "application/x-sv4cpio" },

　　{ ".sv4crc", "application/x-sv4crc" },

　　{ ".svf", "image/vnd" },

　　{ ".svg", "image/svg+xml" },

　　{ ".svh", "image/svh" },

　　{ ".svr", "x-world/x-svr" },

　　{ ".swf", "application/x-shockwave-flash" },

　　{ ".swfl", "application/x-shockwave-flash" },

　　{ ".t", "application/x-troff" },

　　{ ".tad", "application/octet-stream" },

　　{ ".talk", "text/x-speech" },

　　{ ".tar", "application/x-tar" },

　　{ ".taz", "application/x-tar" },

　　{ ".tbp", "application/x-timbuktu" },

　　{ ".tbt", "application/x-timbuktu" },

　　{ ".tcl", "application/x-tcl" },

　　{ ".tex", "application/x-tex" },

　　{ ".texi", "application/x-texinfo" },

　　{ ".texinfo", "application/x-texinfo" },

　　{ ".tgz", "application/x-compressed" },

　　{ ".thm", "application/vnd.eri.thm" },

　　{ ".tif", "image/tiff" },

　　{ ".tiff", "image/tiff" },

　　{ ".tki", "application/x-tkined" },

　　{ ".tkined", "application/x-tkined" },

　　{ ".toc", "application/toc" },

　　{ ".toy", "image/toy" },

　　{ ".tr", "application/x-troff" },

　　{ ".trk", "x-lml/x-gps" },

　　{ ".trm", "application/x-msterminal" },

　　{ ".tsi", "audio/tsplayer" },

　　{ ".tsp", "application/dsptype" },

　　{ ".tsv", "text/tab-separated-values" },

　　{ ".ttf", "application/octet-stream" },

　　{ ".ttz", "application/t-time" },

　　{ ".txt", "text/plain" },

　　{ ".uls", "text/iuls" },

　　{ ".ult", "audio/x-mod" },

　　{ ".ustar", "application/x-ustar" },

　　{ ".uu", "application/x-uuencode" },

　　{ ".uue", "application/x-uuencode" },

　　{ ".vcd", "application/x-cdlink" },

　　{ ".vcf", "text/x-vcard" },

　　{ ".vdo", "video/vdo" },

　　{ ".vib", "audio/vib" },

　　{ ".viv", "video/vivo" },

　　{ ".vivo", "video/vivo" },

　　{ ".vmd", "application/vocaltec-media-desc" },

　　{ ".vmf", "application/vocaltec-media-file" },

　　{ ".vmi", "application/x-dreamcast-vms-info" },

　　{ ".vms", "application/x-dreamcast-vms" },

　　{ ".vox", "audio/voxware" },

　　{ ".vqe", "audio/x-twinvq-plugin" },

　　{ ".vqf", "audio/x-twinvq" },

　　{ ".vql", "audio/x-twinvq" },

　　{ ".vre", "x-world/x-vream" },

　　{ ".vrml", "x-world/x-vrml" },

　　{ ".vrt", "x-world/x-vrt" },

　　{ ".vrw", "x-world/x-vream" },

　　{ ".vts", "workbook/formulaone" },

　　{ ".wav", "audio/x-wav" },

　　{ ".wax", "audio/x-ms-wax" },

　　{ ".wbmp", "image/vnd.wap.wbmp" },

　　{ ".wcm", "application/vnd.ms-works" },

　　{ ".wdb", "application/vnd.ms-works" },

　　{ ".web", "application/vnd.xara" },

　　{ ".wi", "image/wavelet" },

　　{ ".wis", "application/x-InstallShield" },

　　{ ".wks", "application/vnd.ms-works" },

　　{ ".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" },

　　{ ".wmlscript", "text/vnd.wap.wmlscript" },

　　{ ".wmv", "audio/x-ms-wmv" },

　　{ ".wmx", "video/x-ms-wmx" },

　　{ ".wmz", "application/x-ms-wmz" },

　　{ ".wpng", "image/x-up-wpng" },

　　{ ".wps", "application/vnd.ms-works" },

　　{ ".wpt", "x-lml/x-gps" },

　　{ ".wri", "application/x-mswrite" },

　　{ ".wrl", "x-world/x-vrml" },

　　{ ".wrz", "x-world/x-vrml" },

　　{ ".ws", "text/vnd.wap.wmlscript" },

　　{ ".wsc", "application/vnd.wap.wmlscriptc" },

　　{ ".wv", "video/wavelet" },

　　{ ".wvx", "video/x-ms-wvx" },

　　{ ".wxl", "application/x-wxl" },

　　{ ".x-gzip", "application/x-gzip" },

　　{ ".xaf", "x-world/x-vrml" },

　　{ ".xar", "application/vnd.xara" },

　　{ ".xbm", "image/x-xbitmap" },

　　{ ".xdm", "application/x-xdma" },

　　{ ".xdma", "application/x-xdma" },

　　{ ".xdw", "application/vnd.fujixerox.docuworks" },

　　{ ".xht", "application/xhtml+xml" },

　　{ ".xhtm", "application/xhtml+xml" },

　　{ ".xhtml", "application/xhtml+xml" },

　　{ ".xla", "application/vnd.ms-excel" },

　　{ ".xlc", "application/vnd.ms-excel" },

　　{ ".xll", "application/x-excel" },

　　{ ".xlm", "application/vnd.ms-excel" },

　　{ ".xls", "application/vnd.ms-excel" },

　　{ ".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" },

　　{ ".xlt", "application/vnd.ms-excel" },

　　{ ".xlw", "application/vnd.ms-excel" },

　　{ ".xm", "audio/x-mod" },

　　{".xml","text/plain"},

　　{".xml","application/xml"},[1]

　　{ ".xmz", "audio/x-mod" },

　　{ ".xof", "x-world/x-vrml" },

　　{ ".xpi", "application/x-xpinstall" },

　　{ ".xpm", "image/x-xpixmap" },

　　{ ".xsit", "text/xml" },

　　{ ".xsl", "text/xml" },

　　{ ".xul", "text/xul" },

　　{ ".xwd", "image/x-xwindowdump" },

　　{ ".xyz", "chemical/x-pdb" },

　　{ ".yz1", "application/x-yz1" },

　　{ ".z", "application/x-compress" },[1]

　　{ ".zac", "application/x-zaurus-zac" },

　　{ ".zip", "application/zip" },

　　{ ".json", "application/json" },