Thanks for the response. Simply changing the name of the extension .dll to .pyd does not help. ImportError: DLL load failed: The specified module could not be found. It is not a path problem, as another module in the same location can be imported correctly. I am building the boost_extension_module in Visual Studio IDE. Is there a way to output a pyd directly, instead of dll? What else is required to let Python know about boost_python libs? Thanks. Change your shared library's filename extension from .dll to .pyd. As of Python 2.5, the Python interpreter stopped accepting .dll as a valid extension module filename: http://www.python.org/doc/2.5.4/whatsnew/ports.html#SECTION00015100000000000... "Windows: .dll is no longer supported as a filename extension for extension modules. .pyd is now the only filename extension that will be searched for." _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users