MIME types:
(Multipurpose Internet Mail Extensions)

• Form: class/type
  e.g., text/html, text/plain, image/gif, etc.

• MIME types classify data

• External viewers are specified by mapping MIME types to specific shell commands (via .mailcap)
  • Form: class/type; shell-command
  • %s in command means put file name here

• Example:

     video/mpeg;        mpeg_play %s
  

• Can launch just about anything

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