Considering that Both the VP3 and HUS embroidery formats are used in Husqvarna stitching or embroidery machines, so there should be not a problem to convert one of these format to another. Several embroidery software should support vp3 to hus conversion just fine, some of the good choices are listed here.
Open VP3 file Open HUS 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