The available add-ins and their load behaviors are listed in the Add-in Manager dialog box.
Add-ins that are not loaded at startup are listed without a load behavior.
When an add-in is unloaded, its functionality is not available. However, all translator add-ins (such as DXF, DWF, and DWG) automatically load when that format is selected when doing a Save Copy As. By default, the translators do not load at startup.
You can specify which add-ins to load at startup. You can also unload certain add-ins while in session.
Add-ins for Autodesk Inventor Professional can be loaded/unloaded only on Startup, and not in-session.