非标准子门类 X-types

Type	X-subtype	Description
application	?	Subtypes of an application; the name of the subtype is usually a file format name or an application name.
?	x-aiff	SGI's AIFF audio data format.
?	x-bitmap	An X Windows bitmap image.
?	x-gzip	Data compressed in the GNU gzip format.
?	x-dvi	A TeX DVI document.
?	x-framemaker	A FrameMaker document.
?	x-latex	A LaTeX document.
?	x-macBinHex40	Identical to application/mac-BinHex40, but older software may use this x-type instead.
?	x-mif	A FrameMaker MIF document.
?	x-sd	A session directory protocol announcement, used to announce MBONE events.
?	x-shar	A shell archive; the Unix equivalent of a Windows or Macintosh self-extracting archive. Software shouldn't be configured to unpack shell archives automatically, because a shell archive can call any program the user who runs it has the rights to call.
?	x-tar	A tar archive.
?	x-gtar	A GNU tar archive.
?	x-tcl	A tool command language (TCL) program. You should never configure your web browser or email program to automatically run programs you download from the web or receive in email messages.
?	x-tex	A TeX document.
?	x-texinfo	A GNU texinfo document.
?	x-troff	A troff document.
?	x-troff-man	A troff document written with the man macros.
?	x-troff-me	A troff document that should be processed using the me macros.
?	x-troff-ms	A troff document that should be processed using the ms macros.
?	x-wais-source	A WAIS source.
?	x-www-form-urlencoded	A string that has been encoded like a URL, with + replacing spaces and % escapes replacing non-alphanumeric characters that aren't separators.
audio	?	?
?	x-aiff	The same as application/x-aiff: an AIFF audio file.
?	x-mpeg	The MP3 sound format.
?	x-mpeg.mp3	The MP3 sound format.
?	x-wav	The Windows WAV sound format.
image	?	?
?	x-fits	The FITS image format used primarily by astronomers.
?	x-macpict	A Macintosh PICT image.
?	x-pict	A Macintosh PICT image.
?	x-macpaint	A MacPaint image.
?	x-pbm	A portable bitmap image.
?	x-portable-bitmap	A portable bitmap image.
?	x-pgm	A PGM image.
video	?	?
?	x-msvideo	A Microsoft AVI Video for Windows.
?	x-sgi-movie	A Silicon Graphics movie.