Default packages and dlls

Hello,
I find that most of the system dlls are missing by default and are
available only after installing (turning on) some windows features. For
example "ntmsapi.dll" wont be available in system32 by default. This will be
installed once "Removable Storage Manager" is turned on. Earlier, in Windows
XP or other versions, these dlls are available always.
Now,
1. Could someone please let me know where can I find details on these
kind of changes?
2. Which component has to be added to get "ntdsbcli.dll"?

All your helps are much appreciated.

Thank you!
vishwa