List of common #MIME types found on the internet pretty printed in #JSON.

common-mime-types.json

{
  ".3dm": "x-world/x-3dmf",
  ".3dmf": "x-world/x-3dmf",
  ".a": "application/octet-stream",
  ".aab": "application/x-authorware-bin",
  ".aam": "application/x-authorware-map",
  ".aas": "application/x-authorware-seg",
  ".abc": "text/vnd.abc",
  ".acgi": "text/html",
  ".afl": "video/animaflex",
  ".ai": "application/postscript",
  ".aif": "audio/x-aiff",
  ".aifc": "audio/x-aiff",
  ".aiff": "audio/x-aiff",
  ".aim": "application/x-aim",
  ".aip": "text/x-audiosoft-intra",
  ".ani": "application/x-navi-animation",
  ".aos": "application/x-nokia-9000-communicator-add-on-software",
  ".aps": "application/mime",
  ".arc": "application/octet-stream",
  ".arj": "application/octet-stream",
  ".art": "image/x-jg",
  ".asf": "video/x-ms-asf",
  ".asm": "text/x-asm",
  ".asp": "text/asp",
  ".asx": "video/x-ms-asf-plugin",
  ".au": "audio/x-au",
  ".avi": "video/x-msvideo",
  ".avs": "video/avs-video",
  ".bcpio": "application/x-bcpio",
  ".bin": "application/x-macbinary",
  ".bm": "image/bmp",
  ".bmp": "image/x-windows-bmp",
  ".boo": "application/book",
  ".book": "application/book",
  ".boz": "application/x-bzip2",
  ".bsh": "application/x-bsh",
  ".bz": "application/x-bzip",
  ".bz2": "application/x-bzip2",
  ".c": "text/x-c",
  ".c++": "text/plain",
  ".cat": "application/vnd.ms-pki.seccat",
  ".cc": "text/x-c",
  ".ccad": "application/clariscad",
  ".cco": "application/x-cocoa",
  ".cdf": "application/x-netcdf",
  ".cer": "application/x-x509-ca-cert",
  ".cha": "application/x-chat",
  ".chat": "application/x-chat",
  ".class": "application/x-java-class",
  ".com": "text/plain",
  ".conf": "text/plain",
  ".cpio": "application/x-cpio",
  ".cpp": "text/x-c",
  ".cpt": "application/x-cpt",
  ".crl": "application/pkix-crl",
  ".crt": "application/x-x509-user-cert",
  ".csh": "text/x-script.csh",
  ".css": "text/css",
  ".cxx": "text/plain",
  ".dcr": "application/x-director",
  ".deepv": "application/x-deepv",
  ".def": "text/plain",
  ".der": "application/x-x509-ca-cert",
  ".dif": "video/x-dv",
  ".dir": "application/x-director",
  ".dl": "video/x-dl",
  ".doc": "application/msword",
  ".dot": "application/msword",
  ".dp": "application/commonground",
  ".drw": "application/drafting",
  ".dump": "application/octet-stream",
  ".dv": "video/x-dv",
  ".dvi": "application/x-dvi",
  ".dwf": "model/vnd.dwf",
  ".dwg": "image/x-dwg",
  ".dxf": "image/x-dwg",
  ".dxr": "application/x-director",
  ".el": "text/x-script.elisp",
  ".elc": "application/x-elc",
  ".env": "application/x-envoy",
  ".eps": "application/postscript",
  ".es": "application/x-esrehber",
  ".etx": "text/x-setext",
  ".evy": "application/x-envoy",
  ".exe": "application/octet-stream",
  ".f": "text/x-fortran",
  ".f77": "text/x-fortran",
  ".f90": "text/x-fortran",
  ".fdf": "application/vnd.fdf",
  ".fif": "image/fif",
  ".fli": "video/x-fli",
  ".flo": "image/florian",
  ".flx": "text/vnd.fmi.flexstor",
  ".fmf": "video/x-atomic3d-feature",
  ".for": "text/x-fortran",
  ".fpx": "image/vnd.net-fpx",
  ".frl": "application/freeloader",
  ".funk": "audio/make",
  ".g": "text/plain",
  ".g3": "image/g3fax",
  ".gif": "image/gif",
  ".gl": "video/x-gl",
  ".gsd": "audio/x-gsm",
  ".gsm": "audio/x-gsm",
  ".gsp": "application/x-gsp",
  ".gss": "application/x-gss",
  ".gtar": "application/x-gtar",
  ".gz": "application/x-gzip",
  ".gzip": "multipart/x-gzip",
  ".h": "text/x-h",
  ".hdf": "application/x-hdf",
  ".help": "application/x-helpfile",
  ".hgl": "application/vnd.hp-hpgl",
  ".hh": "text/x-h",
  ".hlb": "text/x-script",
  ".hlp": "application/x-winhelp",
  ".hpg": "application/vnd.hp-hpgl",
  ".hpgl": "application/vnd.hp-hpgl",
  ".hqx": "application/x-mac-binhex40",
  ".hta": "application/hta",
  ".htc": "text/x-component",
  ".htm": "text/html",
  ".html": "text/html",
  ".htmls": "text/html",
  ".htt": "text/webviewhtml",
  ".htx ": "text/html",
  ".ice ": "x-conference/x-cooltalk",
  ".ico": "image/x-icon",
  ".idc": "text/plain",
  ".ief": "image/ief",
  ".iefs": "image/ief",
  ".iges": "application/iges",
  ".iges ": "model/iges",
  ".igs": "model/iges",
  ".ima": "application/x-ima",
  ".imap": "application/x-httpd-imap",
  ".inf ": "application/inf",
  ".ins": "application/x-internett-signup",
  ".ip ": "application/x-ip2",
  ".isu": "video/x-isvideo",
  ".it": "audio/it",
  ".iv": "application/x-inventor",
  ".ivr": "i-world/i-vrml",
  ".ivy": "application/x-livescreen",
  ".jam ": "audio/x-jam",
  ".jav": "text/x-java-source",
  ".java": "text/plain",
  ".java ": "text/x-java-source",
  ".jcm ": "application/x-java-commerce",
  ".jfif": "image/pjpeg",
  ".jfif-tbnl": "image/jpeg",
  ".jpe": "image/pjpeg",
  ".jpeg": "image/pjpeg",
  ".jpg ": "image/pjpeg",
  ".jps": "image/x-jps",
  ".js ": "application/x-javascript",
  ".jut": "image/jutvision",
  ".kar": "music/x-karaoke",
  ".ksh": "text/x-script.ksh",
  ".la ": "audio/x-nspaudio",
  ".lam": "audio/x-liveaudio",
  ".latex ": "application/x-latex",
  ".lha": "application/x-lha",
  ".lhx": "application/octet-stream",
  ".list": "text/plain",
  ".lma": "audio/x-nspaudio",
  ".log ": "text/plain",
  ".lsp ": "text/x-script.lisp",
  ".lst ": "text/plain",
  ".lsx": "text/x-la-asf",
  ".ltx": "application/x-latex",
  ".lzh": "application/x-lzh",
  ".lzx": "application/x-lzx",
  ".m": "text/x-m",
  ".m1v": "video/mpeg",
  ".m2a": "audio/mpeg",
  ".m2v": "video/mpeg",
  ".m3u ": "audio/x-mpequrl",
  ".man": "application/x-troff-man",
  ".map": "application/x-navimap",
  ".mar": "text/plain",
  ".mbd": "application/mbedlet",
  ".mc$": "application/x-magic-cap-package-1.0",
  ".mcd": "application/x-mathcad",
  ".mcf": "text/mcf",
  ".mcp": "application/netmc",
  ".me ": "application/x-troff-me",
  ".mht": "message/rfc822",
  ".mhtml": "message/rfc822",
  ".mid": "x-music/x-midi",
  ".midi": "x-music/x-midi",
  ".mif": "application/x-mif",
  ".mime ": "www/mime",
  ".mjf": "audio/x-vnd.audioexplosion.mjuicemediafile",
  ".mjpg ": "video/x-motion-jpeg",
  ".mm": "application/x-meme",
  ".mme": "application/base64",
  ".mod": "audio/x-mod",
  ".moov": "video/quicktime",
  ".mov": "video/quicktime",
  ".movie": "video/x-sgi-movie",
  ".mp2": "video/x-mpeq2a",
  ".mp3": "video/x-mpeg",
  ".mpa": "video/mpeg",
  ".mpc": "application/x-project",
  ".mpe": "video/mpeg",
  ".mpeg": "video/mpeg",
  ".mpg": "video/mpeg",
  ".mpga": "audio/mpeg",
  ".mpp": "application/vnd.ms-project",
  ".mpt": "application/x-project",
  ".mpv": "application/x-project",
  ".mpx": "application/x-project",
  ".mrc": "application/marc",
  ".ms": "application/x-troff-ms",
  ".mv": "video/x-sgi-movie",
  ".my": "audio/make",
  ".mzz": "application/x-vnd.audioexplosion.mzz",
  ".nap": "image/naplps",
  ".naplps": "image/naplps",
  ".nc": "application/x-netcdf",
  ".ncm": "application/vnd.nokia.configuration-message",
  ".nif": "image/x-niff",
  ".niff": "image/x-niff",
  ".nix": "application/x-mix-transfer",
  ".nsc": "application/x-conference",
  ".nvd": "application/x-navidoc",
  ".o": "application/octet-stream",
  ".oda": "application/oda",
  ".omc": "application/x-omc",
  ".omcd": "application/x-omcdatamaker",
  ".omcr": "application/x-omcregerator",
  ".p": "text/x-pascal",
  ".p10": "application/x-pkcs10",
  ".p12": "application/x-pkcs12",
  ".p7a": "application/x-pkcs7-signature",
  ".p7c": "application/x-pkcs7-mime",
  ".p7m": "application/x-pkcs7-mime",
  ".p7r": "application/x-pkcs7-certreqresp",
  ".p7s": "application/pkcs7-signature",
  ".part ": "application/pro_eng",
  ".pas": "text/pascal",
  ".pbm ": "image/x-portable-bitmap",
  ".pcl": "application/x-pcl",
  ".pct": "image/x-pict",
  ".pcx": "image/x-pcx",
  ".pdb": "chemical/x-pdb",
  ".pdf": "application/pdf",
  ".pfunk": "audio/make.my.funk",
  ".pgm": "image/x-portable-greymap",
  ".pic": "image/pict",
  ".pict": "image/pict",
  ".pkg": "application/x-newton-compatible-pkg",
  ".pko": "application/vnd.ms-pki.pko",
  ".pl": "text/x-script.perl",
  ".plx": "application/x-pixclscript",
  ".pm": "text/x-script.perl-module",
  ".pm4 ": "application/x-pagemaker",
  ".pm5": "application/x-pagemaker",
  ".png": "image/png",
  ".pnm": "image/x-portable-anymap",
  ".pot": "application/vnd.ms-powerpoint",
  ".pov": "model/x-pov",
  ".ppa": "application/vnd.ms-powerpoint",
  ".ppm": "image/x-portable-pixmap",
  ".pps": "application/vnd.ms-powerpoint",
  ".ppt": "application/x-mspowerpoint",
  ".ppz": "application/mspowerpoint",
  ".pre": "application/x-freelance",
  ".prt": "application/pro_eng",
  ".ps": "application/postscript",
  ".psd": "application/octet-stream",
  ".pvu": "paleovu/x-pv",
  ".pwz ": "application/vnd.ms-powerpoint",
  ".py ": "text/x-script.phyton",
  ".pyc ": "applicaiton/x-bytecode.python",
  ".qcp ": "audio/vnd.qcelp",
  ".qd3 ": "x-world/x-3dmf",
  ".qd3d ": "x-world/x-3dmf",
  ".qif": "image/x-quicktime",
  ".qt": "video/quicktime",
  ".qtc": "video/x-qtc",
  ".qti": "image/x-quicktime",
  ".qtif": "image/x-quicktime",
  ".ra": "audio/x-realaudio",
  ".ram": "audio/x-pn-realaudio",
  ".ras": "image/x-cmu-raster",
  ".rast": "image/cmu-raster",
  ".rexx ": "text/x-script.rexx",
  ".rf": "image/vnd.rn-realflash",
  ".rgb ": "image/x-rgb",
  ".rm": "audio/x-pn-realaudio",
  ".rmi": "audio/mid",
  ".rmm ": "audio/x-pn-realaudio",
  ".rmp": "audio/x-pn-realaudio-plugin",
  ".rng": "application/vnd.nokia.ringing-tone",
  ".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",
  ".rtf": "text/richtext",
  ".rtx": "text/richtext",
  ".rv": "video/vnd.rn-realvideo",
  ".s": "text/x-asm",
  ".s3m ": "audio/s3m",
  ".saveme": "application/octet-stream",
  ".sbk ": "application/x-tbook",
  ".scm": "video/x-scm",
  ".sdml": "text/plain",
  ".sdp ": "application/x-sdp",
  ".sdr": "application/sounder",
  ".sea": "application/x-sea",
  ".set": "application/set",
  ".sgm ": "text/x-sgml",
  ".sgml": "text/x-sgml",
  ".sh": "text/x-script.sh",
  ".shar": "application/x-shar",
  ".shtml ": "text/html",
  ".shtml": "text/x-server-parsed-html",
  ".sid": "audio/x-psid",
  ".sit": "application/x-stuffit",
  ".skd": "application/x-koan",
  ".skm ": "application/x-koan",
  ".skp ": "application/x-koan",
  ".skt ": "application/x-koan",
  ".sl ": "application/x-seelogo",
  ".smi ": "application/smil",
  ".smil ": "application/smil",
  ".snd": "audio/x-adpcm",
  ".sol": "application/solids",
  ".spc ": "text/x-speech",
  ".spl": "application/futuresplash",
  ".spr": "application/x-sprite",
  ".sprite ": "application/x-sprite",
  ".src": "application/x-wais-source",
  ".ssi": "text/x-server-parsed-html",
  ".ssm ": "application/streamingmedia",
  ".sst": "application/vnd.ms-pki.certstore",
  ".step": "application/step",
  ".stl": "application/x-navistyle",
  ".stp": "application/step",
  ".sv4cpio": "application/x-sv4cpio",
  ".sv4crc": "application/x-sv4crc",
  ".svf": "image/x-dwg",
  ".svr": "x-world/x-svr",
  ".swf": "application/x-shockwave-flash",
  ".t": "application/x-troff",
  ".talk": "text/x-speech",
  ".tar": "application/x-tar",
  ".tbk": "application/x-tbook",
  ".tcl": "text/x-script.tcl",
  ".tcsh": "text/x-script.tcsh",
  ".tex": "application/x-tex",
  ".texi": "application/x-texinfo",
  ".texinfo": "application/x-texinfo",
  ".text": "text/plain",
  ".tgz": "application/x-compressed",
  ".tif": "image/x-tiff",
  ".tiff": "image/x-tiff",
  ".tr": "application/x-troff",
  ".tsi": "audio/tsp-audio",
  ".tsp": "audio/tsplayer",
  ".tsv": "text/tab-separated-values",
  ".turbot": "image/florian",
  ".txt": "text/plain",
  ".uil": "text/x-uil",
  ".uni": "text/uri-list",
  ".unis": "text/uri-list",
  ".unv": "application/i-deas",
  ".uri": "text/uri-list",
  ".uris": "text/uri-list",
  ".ustar": "multipart/x-ustar",
  ".uu": "text/x-uuencode",
  ".uue": "text/x-uuencode",
  ".vcd": "application/x-cdlink",
  ".vcs": "text/x-vcalendar",
  ".vda": "application/vda",
  ".vdo": "video/vdo",
  ".vew ": "application/groupwise",
  ".viv": "video/vnd.vivo",
  ".vivo": "video/vnd.vivo",
  ".vmd ": "application/vocaltec-media-desc",
  ".vmf": "application/vocaltec-media-file",
  ".voc": "audio/x-voc",
  ".vos": "video/vosaic",
  ".vox": "audio/voxware",
  ".vqe": "audio/x-twinvq-plugin",
  ".vqf": "audio/x-twinvq",
  ".vql": "audio/x-twinvq-plugin",
  ".vrml": "x-world/x-vrml",
  ".vrt": "x-world/x-vrt",
  ".vsd": "application/x-visio",
  ".vst": "application/x-visio",
  ".vsw ": "application/x-visio",
  ".w60": "application/wordperfect6.0",
  ".w61": "application/wordperfect6.1",
  ".w6w": "application/msword",
  ".wav": "audio/x-wav",
  ".wb1": "application/x-qpro",
  ".wbmp": "image/vnd.wap.wbmp",
  ".web": "application/vnd.xara",
  ".wiz": "application/msword",
  ".wk1": "application/x-123",
  ".wmf": "windows/metafile",
  ".wml": "text/vnd.wap.wml",
  ".wmlc ": "application/vnd.wap.wmlc",
  ".wmls": "text/vnd.wap.wmlscript",
  ".wmlsc ": "application/vnd.wap.wmlscriptc",
  ".word ": "application/msword",
  ".wp": "application/wordperfect",
  ".wp5": "application/wordperfect6.0",
  ".wp6 ": "application/wordperfect",
  ".wpd": "application/x-wpwin",
  ".wq1": "application/x-lotus",
  ".wri": "application/x-wri",
  ".wrl": "x-world/x-vrml",
  ".wrz": "x-world/x-vrml",
  ".wsc": "text/scriplet",
  ".wsrc": "application/x-wais-source",
  ".wtk ": "application/x-wintalk",
  ".xbm": "image/xbm",
  ".xdr": "video/x-amt-demorun",
  ".xgz": "xgl/drawing",
  ".xif": "image/vnd.xiff",
  ".xl": "application/excel",
  ".xla": "application/x-msexcel",
  ".xlb": "application/x-excel",
  ".xlc": "application/x-excel",
  ".xld ": "application/x-excel",
  ".xlk": "application/x-excel",
  ".xll": "application/x-excel",
  ".xlm": "application/x-excel",
  ".xls": "application/x-msexcel",
  ".xlt": "application/x-excel",
  ".xlv": "application/x-excel",
  ".xlw": "application/x-msexcel",
  ".xm": "audio/xm",
  ".xml": "text/xml",
  ".xmz": "xgl/movie",
  ".xpix": "application/x-vnd.ls-xpix",
  ".xpm": "image/xpm",
  ".x-png": "image/png",
  ".xsr": "video/x-amt-showrun",
  ".xwd": "image/x-xwindowdump",
  ".xyz": "chemical/x-pdb",
  ".z": "application/x-compressed",
  ".zip": "multipart/x-zip",
  ".zoo": "application/octet-stream",
  ".zsh": "text/x-script.zsh"
}

Source: http://www.webmaster-toolkit.com/mime-types.shtml