id summary reporter owner description type status milestone component version severity resolution keywords cc 9450 fstream open utf8 filename fails x86_64-w64-mingw32 spoo@… Beman Dawes "boost::filesystem stream classes won't open files with non-ascii filenames provided as utf-8 strings. This happens with and without imbuing a locale as specified in the boost doc page ""Default Encoding under Microsoft Windows"". My example is basically the example on that page, but with an ifstream. I compiled boost on Arch Linux using the AUR mingw-w64 packages. I reproduced the issue on Windows 7 x64, Windows 7 x64 VM, and in x64 Wine. I confirmed that the file exists and is named properly by making a parallel test program using _wopen (the file opened successfully)." Bugs new To Be Determined filesystem Boost 1.55.0 Problem