Deleting "Features" folders in FeatureManager

I'm working with one assembly in which the FeatureManager has a folder named "Features" for every part, including every new part that I add.  None of my other assemblies have this annoying "feature".  How do I delete the "Features" folders and prevent them from reappearing?

BTW, this is SW 2006.  Don't get me started about the later versions.

SolidworksAssemblies