> If you look in "Trinity Control Center"  "KDE Components"  Component 
> Chooser and Default Applications,  contain the same options and for 
> all intents and purpose are identical except for the name.
Not sure which TDE version is there, but it must be on a transition path. In the latest sources, KDE Components has been replaced by TDE Components and same goes for Component chooser and Default Application. 
Cheers
  Michele