This is why we do not use wchar_t as a cross platform type. We like "char *" with NULL terminated Utf8 strings, which works really well on all platforms. Unfortunately on Windows, some of the core API still take Utf16 (2 bytes per char). Since it is a Windows call it must be in an #ifdef anyway, and so IMMEDIATELY BEFORE calling into the Windows call at the last possible moment we convert the string from Utf8 to Utf16. It sounds like a pain, but after you have wrapped all your OS specific calls (like File I/O) you're calling the higher level anyway, and it was completely worth it.