The Sewing Place

Janome Machine embroidery file formats - .JAN, .EMB, .JEF, .JEF+ and .JPX

Morgan

http://janome.com/siteassets/blog/2016/janome-embroidery-formats.pdf
explains what each file contains


.JAN and .EMB  are Design (master) files


The rest are old and new Stitch files
One that isn't there is  .sew which is a much earlier version of a stitch file