Several embroidery design programs support both the PES (Brother, Babylock, Bernina) and the EMB embroidery formats and as such could re-save one to another so they can be used in different stitching machines. Therefore pes to emb conversion should be easy enough to achieve.
Open PES file Open EMB fileAn embroidery editor and converter
An easy embroidery and apparel decoration design software
A free software for viewing and converting of various embroidery formats