use setlocale if support

gframe/config.h

@@ -72,7 +72,12 @@ inline FILE* mywfopen(const wchar_t* filename, const char* mode) {
 	return fp;
 }
 
-#ifdef _WIN32
+#if !defined(_WIN32)
+#define myfopen std::fopen
+#elif defined(WDK_NTDDI_VERSION) && (WDK_NTDDI_VERSION >= 0x0A000005) // Redstone 4, Version 1803, Build 17134.
+#define FOPEN_WINDOWS_SUPPORT_UTF8
+#define myfopen std::fopen
+#else
 inline FILE* myfopen(const char* filename, const char* mode) {
 	wchar_t wfilename[256]{};
 	BufferIO::DecodeUTF8(filename, wfilename);
@@ -80,8 +85,6 @@ inline FILE* myfopen(const char* filename, const char* mode) {
 	BufferIO::CopyCharArray(mode, wmode);
 	return _wfopen(wfilename, wmode);
 }
-#else
-#define myfopen std::fopen
 #endif
 
 #include <irrlicht.h>

gframe/gframe.cpp

@@ -23,8 +23,10 @@ void ClickButton(irr::gui::IGUIElement* btn) {
 }
 
 int main(int argc, char* argv[]) {
-#ifndef _WIN32
+#if !defined(_WIN32)
 	std::setlocale(LC_CTYPE, "UTF-8");
+#elif defined(FOPEN_WINDOWS_SUPPORT_UTF8)
+	setlocale(LC_CTYPE, ".UTF8");
 #endif
 #ifdef __APPLE__
 	CFURLRef bundle_url = CFBundleCopyBundleURL(CFBundleGetMainBundle());