Windows System Files - Best Practice

Howdy All,

Looking for suggestions on best practice for installing some of the older Windows System files. Used to these files "Had" to be installed because the were not included with windows but now I think, although I have not confirmed, that these files are now included with all the windows since XP out of the box. Files I'm talking about are things like

MFC42.dll MSVCR.dll, dao360.dll, msado26.tlb scrrun.dll

Can anybody say definitively if these should not be included in installs for XP and newer OS's?

Thanks

dbl