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I tried the following:
setup(
 data_files = [(sys.prefix_exec, os.path.join('Win32', 'BeaEngine.dll'))]
 # (... rest of the setup call here...)
)
This works perfectly when running the "python setup.py install". But when generating an installer (not MSI but the exe file), the installer places the 'BeaEngine.dll' in a subdirectory called 'python27'. For 64 bit builds, the subdirectory is called 'Python27-x64' instead.
The paths to my python installations are "C:\Python27" and "C:\Python27-x64" respectively. The target folders should have been those, not "C:\Python27-x64\Python27-x64" which is clearly wrong.
So far my workaround was this:
 data_files = [(os.path.join(sys.prefix_exec,'..'), os.path.join('Win32', 'BeaEngine.dll'))]
But of course, now my setup.py script only works for generating the installer, not for installing the module from sources.