Husqvarna/Viking/Pfaff embroideries in VP3 format can be rather easily converted to Janome JEF format with several popular embroidery programs. Such vp3 to jef conversion can be typically done with some dedicated embroidery software or converters, some good software picks are listed here.
Open VP3 file Open JEF fileAn embroidery designs manager
A converter for embroidery designes
Advanced version of the popular Embroidermodder
A free embroidery editor and converter
An embroidery editor and converter