Installer vs py2exe: Windows DLLs

[Paul Moore]

When building a distribution for the same script using Gordon
McMillan's Installer and py2exe, I notice that Installer includes
PyWinTypes22.dll and win32api.pyd, whereas py2exe doesn't. Both
executables run fine, so these 2 DLLs are clearly not needed in
practice.

Why is there a difference, and can Installer be made to exclude these
two files when they are not needed, as py2exe does?

More to the point, in some ways, why does Installer think these files
are needed? Is there some situation in which py2exe generated
executables will fail because these files aren't there?

Paul.