Для более или менее полного списка проверьте карту ниже (C ++, но все же легко изменить ее на C #).
Вот так Google / Chrome распознает расширение файла формы типа контента (не знаю, как генерируется тело письма - с помощью JavaScript на стороне клиента или из POST на стороне сервера - я думаю, что последнее). Я получил этот список, используя следующий трюк:
Поиск наиболее часто используемых расширений файлов в Интернете. Мне повезло найти HTML-таблицу, чтобы я мог скопировать и вставить ее в Excel, чтобы получить чистый список только расширений.
Создан небольшой файл test с несколькими символами содержимого.
Использовал список расширений в (2) и некоторую магию командной строки для создания файлов test.TXT, test.HTM, test.TIFF и так далее. Вариант Linux - for file in test.TXT test.HTM test.TIFF ... ; do cp test "$file"; done;
Все эти файлы отправлены в мой gmail в виде вложений. Обратите внимание, что некоторые файлы, такие как .exe и .zip были отфильтрованы по соображениям безопасности. Они отсутствуют в коде ниже!
В gmail скачал оригинал, там можно увидеть Content-Type: application/pdf; name="example.pdf" строк для каждого из прикрепленных файлов. Разобрали это в VIM, чтобы получить список ниже.
Если вы хотите добавить расширение, которого нет в списке ниже - создайте небольшой файл sample.xyz , отправьте его себе и посмотрите на необработанное электронное письмо для Content-Type. Это хитрость. Надеюсь, это поможет!
P.S. Я знаю, что это не лучший список, но мне было достаточно узнать, как программно отправлять вложения электронной почты и выбирать Content-Type по расширению файла, как это делал бы gmail. Не будьте грубыми, если некоторые типы расширений «отсутствуют».
static const map<string, string> 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" }
};