You can call AddFileAttachment2 when you already know the content-
type:

email.AddFileAttachment2("something.edn","application/edine")

When using the AddFileAttachment method, Chilkat determines the
content-type automatically based on the file extension. Chilkat
uses a hard-coded mapping table for this purpose -- mainly because
we want consistent behaviour across all systems, especially when
your app is deployed to end-users.

Here is our current content-type mappings, pulled directly from the
source:

char *MimeContentType[] = {

"application/envoy",

"evy",






"application/fractals",

"fif",


"application/x-shockwave-flash",

"swf",




"application/futuresplash",

"spl",






"application/hta",

"hta",






"application/internet-property-tream",

"acx",






"application/mac-binhex40",

"hqx",






"application/msword",

"doc",






"application/msword",

"dot",






"application/octet-stream",

"*",






"application/octet-stream",

"bin",






"application/octet-stream",

"class",






"application/octet-stream",

"dms",






"application/octet-stream",

"exe",






"application/octet-stream",

"lha",






"application/octet-stream",

"lzh",






"application/oda",

"oda",






"application/olescript",

"axs",






"application/pdf",

"pdf",






"application/pics-rules",

"prf",






"application/pkcs10",

"p10",






"application/pkix-crl",

"crl",






"application/postscript",

"ai",






"application/postscript",

"eps",






"application/postscript",

"ps",






"application/rtf",

"rtf",






"application/set-payment-initiation",

"setpay",






"application/set-registration-initiation",

"setreg",






"application/vnd.ms-excel",

"xla",






"application/vnd.ms-excel",

"xlc",






"application/vnd.ms-excel",

"xlm",






"application/vnd.ms-excel",

"xls",






"application/vnd.ms-excel",

"xlt",






"application/vnd.ms-excel",

"xlw",






"application/vnd.ms-pkicertstore",

"sst",






"application/vnd.ms-pkiseccat",

"cat",






"application/vnd.ms-pkistl",

"stl",






"application/vnd.ms-powerpoint",

"pot",






"application/vnd.ms-powerpoint",

"pps",






"application/vnd.ms-powerpoint",

"ppt",






"application/vnd.ms-project",

"mpp",






"application/vnd.ms-works",

"wcm",






"application/vnd.ms-works",

"wdb",






"application/vnd.ms-works",

"wks",






"application/vnd.ms-works",

"wps",






"application/winhlp",

"hlp",






"application/x-bcpio",

"bcpio",






"application/x-cdf",

"cdf",






"application/x-compress",

"z",






"application/x-compressed",

"tgz",






"application/x-cpio",

"cpio",






"application/x-csh",

"csh",






"application/x-director",

"dcr",






"application/x-director",

"dir",






"application/x-director",

"dxr",






"application/x-dvi",

"dvi",






"application/x-gtar",

"gtar",






"application/x-gzip",

"gz",






"application/x-hdf",

"hdf",






"application/x-internet-ignup",

"ins",






"application/x-internet-ignup",

"isp",






"application/x-iphone",

"iii",






"application/x-javascript",

"js",






"application/x-latex",

"latex",






"application/x-msaccess",

"mdb",






"application/x-mscardfile",

"crd",






"application/x-msclip",

"clp",






"application/x-msdownload",

"dll",






"application/x-msmediaview",

"m13",






"application/x-msmediaview",

"m14",






"application/x-msmediaview",

"mvb",






"application/x-msmetafile",

"wmf",






"application/x-msmoney",

"mny",






"application/x-mspublisher",

"pub",






"application/x-msschedule",

"scd",






"application/x-msterminal",

"trm",






"application/x-mswrite",

"wri",






"application/x-netcdf",

"cdf",






"application/x-netcdf",

"nc",






"application/x-perfmon",

"pma",






"application/x-perfmon",

"pmc",






"application/x-perfmon",

"pml",






"application/x-perfmon",

"pmr",






"application/x-perfmon",

"pmw",






"application/x-pkcs12",

"p12",






"application/x-pkcs12",

"pfx",






"application/x-pkcs7-certificates",

"p7b",






"application/x-pkcs7-certificates",

"spc",






"application/x-pkcs7-certreqresp",

"p7r",






"application/x-pkcs7-mime",

"p7c",






"application/x-pkcs7-mime",

"p7m",






"application/x-pkcs7-ignature",

"p7s",






"application/x-h",

"sh",






"application/x-har",

"shar",






"application/x-tuffit",

"sit",






"application/x-v4cpio",

"sv4cpio",






"application/x-v4crc",

"sv4crc",






"application/x-tar",

"tar",






"application/x-tcl",

"tcl",






"application/x-tex",

"tex",






"application/x-texinfo",

"texi",






"application/x-texinfo",

"texinfo",






"application/x-troff",

"roff",






"application/x-troff",

"t",






"application/x-troff",

"tr",






"application/x-troff-man",

"man",






"application/x-troff-me",

"me",






"application/x-troff-ms",

"ms",






"application/x-ustar",

"ustar",






"application/x-wais-ource",

"src",






"application/x-x509-ca-cert",

"cer",






"application/x-x509-ca-cert",

"crt",






"application/x-x509-ca-cert",

"der",






"application/ynd.ms-pkipko",

"pko",






"application/zip",

"zip",






"audio/basic",

"au",






"audio/basic",

"snd",






"audio/mid",

"mid",






"audio/mid",

"rmi",






"audio/mpeg",

"mp3",






"audio/x-aiff",

"aif",






"audio/x-aiff",

"aifc",






"audio/x-aiff",

"aiff",






"audio/x-mpegurl",

"m3u",






"audio/x-pn-realaudio",

"ra",






"audio/x-pn-realaudio",

"ram",






"audio/x-wav",

"wav",






"image/bmp",

"bmp",






"image/cis-cod",

"cod",






"image/gif",

"gif",






"image/ief",

"ief",






"image/jpeg",

"jpe",






"image/jpeg",

"jpeg",






"image/jpeg",

"jpg",






"image/pipeg",

"jfif",






"image/tiff",

"tif",






"image/tiff",

"tiff",






"image/x-cmu-raster",

"ras",






"image/x-cmx",

"cmx",






"image/x-icon",

"ico",






"image/x-portable-anymap",

"pnm",






"image/x-portable-bitmap",

"pbm",






"image/x-portable-graymap",

"pgm",






"image/x-portable-pixmap",

"ppm",






"image/x-rgb",

"rgb",






"image/x-xbitmap",

"xbm",






"image/x-xpixmap",

"xpm",






"image/x-xwindowdump",

"xwd",






"message/rfc822",

"mht",






"message/rfc822",

"mhtml",






"message/rfc822",

"nws",






"text/css",

"css",






"text/h323",

"323",






"text/html",

"htm",






"text/html",

"html",






"text/html",

"stm",






"text/iuls",

"uls",






"text/plain",

"bas",






"text/plain",

"c",

"text/plain",

"cpp",






"text/plain",

"h",

"text/plain",

"hpp",






"text/plain",

"txt",






"text/richtext",

"rtx",






"text/scriptlet",

"sct",






"text/tab-eparated-values",

"tsv",






"text/webviewhtml",

"htt",






"text/x-component",

"htc",






"text/x-etext",

"etx",






"text/x-vcard",

"vcf",






"video/mpeg",

"mp2",






"video/mpeg",

"mpa",






"video/mpeg",

"mpe",






"video/mpeg",

"mpeg",






"video/mpeg",

"mpg",






"video/mpeg",

"mpv2",






"video/quicktime",

"mov",






"video/quicktime",

"qt",






"video/x-la-asf",

"lsf",






"video/x-la-asf",

"lsx",






"video/x-ms-asf",

"asf",






"video/x-ms-asf",

"asr",






"video/x-ms-asf",

"asx",






"video/x-msvideo",

"avi",






"video/x-gi-movie",

"movie",






"x-world/x-vrml",

"flr",






"x-world/x-vrml",

"vrml",






"x-world/x-vrml",

"wrl",






"x-world/x-vrml",

"wrz",






"x-world/x-vrml",

"xaf",






"x-world/x-vrml",

"xof",

"",
""

};




--- In chilkat@yahoogroups.com, "pbchilkat" <mparis@x> wrote:
> When mailing an attachment the AddFileAttachment says it will
attach
> accordingly to the extension of the file. On my machine I have an
> extension .edn which works ok with Outlook 2002. When I attach it
it
> says in the mail application/edine as its type.
> Chilkat mail however attaches the file as application/octet-stream.
>
> Does anyone know of this bug in 5.3.0?
> Or does Chilkat check for the extensions in another place?
> Currently the .edn extension is administrated here:
> REGEDIT4
>
> [HKEY_CURRENT_USER\.edn]
> "Default"="edn_auto_file"
> "Content Type"="application/edine"
>
> [HKEY_CURRENT_USER\edn_auto_file]
> "Default"="edine"
>
> [HKEY_CURRENT_USER\edn_auto_file\shell]
>
> [HKEY_CURRENT_USER\edn_auto_file\shell\open]
>
> [HKEY_CURRENT_USER\edn_auto_file\shell\open\command]
> "Default"="notepad.exe %1"