mutt/.mime.types

   1 application/gzip gz
   2 application/pdf pdf
   3 application/zstd zst
   4 image/jpeg jpeg jpg
   5 image/jxl jxl
   6 image/png png
   7 image/webp webp
   8 image/x-djvu djvu
   9 image/x-portable-anymap pnm
  10 image/x-portable-arbitrarymap pam
  11 image/x-portable-bitmap pbm
  12 image/x-portable-floatmap pfm
  13 image/x-portable-graymap pgm
  14 image/x-portable-pixmap ppm
  15 image/x-xpixmap xpm
  16 text/info info
  17 text/plain txt