/usr/include/ace/config-windows.h is in libace-dev 6.3.3+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | /* -*- C++ -*- */
// This is all we need to do to build ACE on a Windows platform (32bit or 64bit)
#include "config-win32.h"
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