The _ctypes extension is not built on Win64, because it
is not yet ported to the AMD64 architecture.

Since I'm working on win64 support in the ctypes SVN
repo, chances are that this can be distributed and
installed as standalone package for Python 2.5.

To avoid problems with the installation, I recommend
that the ctypes package in Lib/ctypes should *NOT* be
included in the Python 2.5 AMD64 msi installer.

The attached patch for Tools/msi/msi.py should
implement this, although I cannot completely test it (I
have not built the AMD64 version of sqlite3, no CHM
file, and so on).

Assigning to MvL because he builds the msi packages.