We have found one software suitable in our database for this conversion.
The only dst to png conversion we know thus far, is an attempt to export Tajima embroidery design (.dst) to a plain raster image in PNG format, perhaps for some kind of preview purpose.
Maybe some embroidery design editors may be of help here, but it seems that latest versions of CorelDraw support Tajima DST format just fine.
A set of tools for graphics designers. With CorelDraw Graphics Suite designers can create vector illustrations, page layout, brouchures, web sites, retouch photos, convert bitmap images and vector images. CorelDraw Graphics Suite is available only for Microsoft Windows.