We have found one software suitable in our database for this conversion.
It is likely that .des files (Corel Designer technical illustrations) can only be created in Corel software, so a png to des conversion may possible be attempted using CorelDraw. Unfortunately, we do not know about any other way how to achieve png to des conversion at this time.
Updated: October 3, 2016
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.