[boost] [filesystem] introduce wide-only mode?

Hi, while porting Boost to evc4 I noticed that Boost.Filesystem makes heavy use of the Ansi Win32-API functions such as CreateFileA etc. There is a mode that can be enabled with the define BOOST_FILESYSTEM_NARROW_ONLY so that only Ansi APIs are used. Is it thinkable to introduce a BOOST_FILESYSTEM_WIDE_ONLY mode, e.g. when BOOST_NO_ANSI_APIS is defined? Should I try to implement such a mode, or is it too complicated? bye Michael