If Turkanis is nowhere to be found someone should really look at all the bugs assigned to him. http://svn.boost.org/trac/boost/query?status=new&status=assigned&status=reopened&owner=turkanis&order=priority 484 Boost.Iostreams and newline translation 525 problem with boost::iostreams when compiled with Visual C++ 579 boost.iostreams file_descriptor and sharing 586 iostreams // file_descriptor::seek BUG on files > 4 GB 699 Changing size of memory-mapped file on Windows 786 bug in iostreams/copy.hpp line 81 791 iostreams::tee_filter is for output only 817 Performance problem in iostreams 822 Incorrect usage of bad_write(), bad_seek() etc. 856 iostreams file_descriptor::write fails under Win32 869 [iostreams] patch for building by BBv2 // Anders