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 text/info info
  10 text/plain txt