MIME> sho file
 Known File Types:
 Extension: HTML, Content-Type: text/html, Encoding: 7bit/8bit

 This example shows "Known File Types" for MIME as defined in the
 MIME program, and any others configured in the MIME$FILETYPES.DAT
 file. When composing a MIME message, the ADD command uses these
 corresponding settings when given only the file name and extension,
 (or file type), for example:

 MIME> add myfile.html

 This would add the file "myfile.html" with the content type set to
 "text/html" and an encoding of "7bit/8bit".