The preference category Operation > CAD Data Management > Content Handling > Download lists the secondary content categories for your site. For each category of file type, if the preference <secondary_content_category> (for example, Instance Accelerator File) is set to yes, it means that any secondary content of the specified category type is downloaded automatically when the primary content is downloaded. Setting the value to false specifies that the secondary content is not downloaded automatically with the primary content of CAD document.