I noticed some failures in Boost.Locale using std backend and narrowed it down to broken Japanese_Japan.932 support of codecvt facet. I tried to report it on https://connect.microsoft.com/VisualStudio but it shown me " You are not authorized to submit the feedback for this connection. " How can I report the bug to Mircrosoft? Thank You, Artyom Below is the sample to reporoduce the issue: Works ok on MSVC 10 and below Fails on MSVC2017 - and it should work ---------------------- #include <iostream> #include <locale> #include <fstream> int main() { { // Japan in Shift JIS/cp932 char const *japan_932 = "\x93\xfa\x96\x7b"; std::ofstream f("testi.txt"); f<<japan_932; f.close(); } try { std::wfstream test; test.imbue(std::locale("Japanese_Japan.932")); test.open("testi.txt"); // Japan in Unicode std::wstring cmp = L"\u65e5\u672c"; std::wstring ref; test >> ref; if(ref != cmp) { std::cout << "FAIL" << std::endl; std::cout << "REF" << std::endl; for(size_t i=0;i<ref.size();i++) std::cout <<std::hex<< unsigned(ref[i]) << std::endl; std::cout << "EXP" << std::endl; for(size_t i=0;i<cmp.size();i++) std::cout <<std::hex<< unsigned(cmp[i]) << std::endl; } else { std::cout << "OK" << std::endl; } } catch(std::exception const &e) { std::cout << "No Locale: " << e.what() << std::endl; } }