It should be possible to export of embroidery designs - .emb to a JPEG format for a preview purposes. This can be typically done in an embroidery software with previewing function which allows users to save the designs as images or PDFs.
For example Wilcom DecoStudio (that heavily uses the .emb files) contains a visualization function that probably allows users to save the embroideries as JPEGs. Such file however, will no longer be useable in stitching machines, it will only be a picture.Open EMB file Open JPG file
An easy embroidery and apparel decoration design software