We have found one software suitable in our database for this conversion.
In most cases Corel formats, including .des files (technical illustrations) can be only opened or exported to other formats in Corel software, in most cases CorelDraw Graphics Suite. So if you hope to print .des files to PDF format, you have to use Corel software.
Updated: September 15, 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.