The primary content of a CAD document is a CAD model file; however, Windchill allows you to attach other file types as secondary content. Additionally, you can specify which file types should be considered outdated, and which should be automatically downloaded with the primary content, as the CAD document moves through the stages (iterations, revisions, life cycle states, and so forth) of development.

For more information, see Specifying Whether or Not to Outdate Secondary Content and Setting the Preference to Automatically Download Secondary Content .