For a more or less complete list check the map below (C++, yet it is straight forward to change it to C#).
This is how Google/Chrome recognizes content type form file extention (don't know how email body is generated - by JavaScript on the client side, or from POST on the server side - my guess is the latter). I got this list using the following trick:
Searched for most commonly used file extentions on the internet. Was lucky to find an html table so that I could copy-paste it to Excel to get a clean list of just the extentions.
Created a small file test with a few characters of contents.
Used the list of extentions in (2) and some command line magic to create files test.TXT, test.HTM, test.TIFF and so on. Linux variant is for file in test.TXT test.HTM test.TIFF ... ; do cp test "$file"; done;
Sent all these files to my gmail as attachments. Note that some files like .exe and .zip were filtered out for security reasons. They are missing in the code below!
In gmail, downloaded the original, there one can see Content-Type: application/pdf; name="example.pdf" lines for each of the attached files. Parsed that in VIM to get the list below.
If you want to add an extention that is not in the list below - create small file sample.xyz, send it to yourself and look at the raw email for Content-Type. That's the trick. Hope it helps!
P.S. I know it’s not the best list but it was sufficient for me to learn how to programmatically send email attachments and choose Content-Type by file extension as good as gmail would do. Don’t be harsh if some extension types are “missing”.
static const map ContentTypes = {
{ "TXT","text/plain" },
{ "HTM","text/html" },
{ "TIFF","image/tiff" },
{ "TMP","application/octet-stream" },
{ "TOAST","application/octet-stream" },
{ "TORRENT","application/x-bittorrent" },
{ "TTF","application/x-font-ttf" },
{ "UUE","application/octet-stream" },
{ "VCD","application/x-cdlink" },
{ "VCF","text/x-vcard" },
{ "VCXPROJ","application/xml" },
{ "VOB","application/octet-stream" },
{ "WAV","audio/x-wav" },
{ "WMA","audio/x-ms-wma" },
{ "WMV","video/x-ms-wmv" },
{ "WPD","application/wordperfect" },
{ "WPS","application/octet-stream" },
{ "XCODEPROJ","application/octet-stream" },
{ "XHTML","application/xhtml+xml" },
{ "XLR","application/octet-stream" },
{ "XLS","application/vnd.ms-excel" },
{ "XLSX","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" },
{ "XML","text/xml" },
{ "YUV","application/octet-stream" },
{ "ZIPX","application/octet-stream" },
{ "3DM","application/octet-stream" },
{ "3DS","application/octet-stream" },
{ "3G2","video/3gpp2" },
{ "3GP","video/3gpp" },
{ "ACCDB","application/octet-stream" },
{ "AI","application/illustrator" },
{ "AIF","audio/x-aiff" },
{ "APK","application/vnd.android.package-archive" },
{ "APP","application/octet-stream" },
{ "ASF","video/x-ms-asf" },
{ "ASP","application/octet-stream" },
{ "ASPX","application/xml" },
{ "AVI","video/x-msvideo" },
{ "BAK","application/octet-stream" },
{ "BIN","application/octet-stream" },
{ "BMP","image/bmp" },
{ "C","text/x-csrc" },
{ "CAB","application/octet-stream" },
{ "CBR","application/octet-stream" },
{ "CER","application/x-x509-ca-cert" },
{ "CFG","application/octet-stream" },
{ "CFM","application/octet-stream" },
{ "CGI","application/octet-stream" },
{ "CLASS","application/octet-stream" },
{ "CPP","text/x-c++src" },
{ "CRDOWNLOAD","application/octet-stream" },
{ "CRX","application/x-chrome-extension" },
{ "CS","text/plain" },
{ "CSR","application/octet-stream" },
{ "CSS","text/css" },
{ "CSV","text/csv" },
{ "CUE","application/octet-stream" },
{ "CUR","application/octet-stream" },
{ "DAT","application/octet-stream" },
{ "DB","application/octet-stream" },
{ "DBF","application/octet-stream" },
{ "DDS","image/vnd.ms-dds" },
{ "DEB","application/x-debian-package" },
{ "DEM","application/octet-stream" },
{ "DESKTHEMEPACK","application/octet-stream" },
{ "DLL","application/octet-stream" },
{ "DMG","application/octet-stream" },
{ "DMP","application/octet-stream" },
{ "DOC","application/msword" },
{ "DOCX","application/vnd.openxmlformats-officedocument.wordprocessingml.document" },
{ "DRV","application/octet-stream" },
{ "DTD","application/xml-dtd" },
{ "DWG","application/octet-stream" },
{ "DXF","application/dxf" },
{ "EPS","application/postscript" },
{ "FLA","application/octet-stream" },
{ "FLV","video/x-flv" },
{ "FNT","application/octet-stream+fnt" },
{ "FON","application/octet-stream+fon" },
{ "GADGET","application/octet-stream" },
{ "GAM","application/octet-stream" },
{ "GED","application/octet-stream" },
{ "GIF","image/gif" },
{ "GPX","application/gpx+xml" },
{ "GZ","application/x-gzip" },
{ "H","text/x-chdr" },
{ "HQX","application/mac-binhex40" },
{ "HTML","text/html" },
{ "ICNS","application/octet-stream" },
{ "ICO","image/x-icon" },
{ "ICS","text/calendar" },
{ "IFF","application/octet-stream" },
{ "INDD","application/octet-stream" },
{ "INI","application/octet-stream" },
{ "ISO","application/octet-stream" },
{ "JAVA","application/octet-stream" },
{ "JPG","image/jpeg" },
{ "JSP","application/octet-stream" },
{ "KEY","application/octet-stream" },
{ "KEYCHAIN","application/octet-stream" },
{ "KML","application/vnd.google-earth.kml+xml" },
{ "KMZ","application/vnd.google-earth.kmz" },
{ "LOG","application/octet-stream" },
{ "LUA","application/octet-stream" },
{ "M","application/octet-stream" },
{ "M3U","audio/x-mpegurl" },
{ "M4A","audio/mp4" },
{ "M4V","video/x-m4v" },
{ "MAX","application/octet-stream" },
{ "MDB","application/octet-stream" },
{ "MDF","application/octet-stream" },
{ "MID","audio/midi" },
{ "MIM","application/octet-stream" },
{ "MOV","video/quicktime" },
{ "MP3","audio/mpeg" },
{ "MP4","video/mp4" },
{ "MPA","audio/mpeg" },
{ "MPG","video/mpeg" },
{ "MSG","application/octet-stream" },
{ "NES","application/octet-stream" },
{ "OBJ","application/octet-stream" },
{ "ODT","application/vnd.oasis.opendocument.text" },
{ "OTF","application/vnd.oasis.opendocument.formula-template" },
{ "PAGES","application/x-iwork-pages-sffpages" },
{ "PART","application/octet-stream" },
{ "PCT","application/octet-stream" },
{ "PDB","chemical/x-pdb" },
{ "PDF","application/pdf" },
{ "PHP","application/x-httpd-php" },
{ "PKG","application/octet-stream" },
{ "PL","application/octet-stream" },
{ "PLUGIN","application/octet-stream" },
{ "PNG","image/png" },
{ "PPS","application/vnd.ms-powerpoint" },
{ "PPT","application/vnd.ms-powerpoint" },
{ "PPTX","application/vnd.openxmlformats-officedocument.presentationml.presentation" },
{ "PRF","application/pics-rules" },
{ "PS","application/postscript" },
{ "PSD","application/photoshop" },
{ "PSPIMAGE","application/octet-stream" },
{ "PY","application/octet-stream" },
{ "RM","audio/x-pn-realaudio" },
{ "ROM","application/octet-stream" },
{ "RPM","application/x-rpm" },
{ "RSS","application/octet-stream" },
{ "RTF","application/rtf" },
{ "SAV","application/octet-stream" },
{ "SDF","application/octet-stream" },
{ "SH","application/x-sh" },
{ "SITX","application/octet-stream" },
{ "SLN","text/plain" },
{ "SQL","application/octet-stream" },
{ "SRT","application/octet-stream" },
{ "SVG","image/svg+xml" },
{ "SWF","application/x-shockwave-flash" },
{ "SWIFT","application/octet-stream" },
{ "TAX2016","application/octet-stream" },
{ "TEX","application/x-tex" }
};
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