It seems that Boost.FileSystem does not implement some methods accepting wpath arguments when compiled with GCC 3.4.3 on Linux. This occurs because BOOST_FILESYSTEM_NARROW_ONLY is defined, which according to the comment in the code occurs for "badly broken compilers or libraries". Ideally, I would like to use the boost::filesystem::copy_file() method on both Windows and Linux, passing wpath arguments in both cases. Is the lack of wpath support simply a problem with GCC 3.4.3, or is wpath never supported for copy_file() with GCC? I can see from the implementation of boost::filesystem::detail::copy_file_api() that open(), read(), and write() are used to copy the file. Since open() accepts only a const char* this may be the limitation. If this is the case, has there been any discussion of providing a copy_file() method which accepts wpath arguments and converts from wchar_t to char before calling copy_file_api(). I do not have a lot of experience with locales and character encodings, so I may be missing something. If this has already been discussed on this mailing list or elsewhere, please point me to the correct discussion, as I have been unable to find it. Thanks. Josh -- Rejoice always. Pray without ceasing. In all circumstances give thanks, for this is the will of God for you in Christ Jesus. -- 1 Thes. 5:16-18 NAB -- I am the living bread that came down from heaven; whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world. -- John 6:51 NAB