The Windchill preference system (under Preference Management > Operation > CAD Data Management > Content Handling > Download) lists the attachment categories for your site. For each category of file type, setting the download preference to true (default is false) means that upon any downloading of a CAD document, any attachments of the specified category type are downloaded automatically along with the primary content. Setting the value to false specifies that any attachments are not downloaded automatically with the primary content of CAD document.