You can get by using the agnostic names for the functions, because the windows header files will handle the conversions for you. For example, inside the WinUse

You can get by using the agnostic names for the functions, because the windows header files will handle the conversions for you. For example, inside the WinUser.h header you'll find this MessageBox definition: #ifdef UNICODE #define MessageBox MessageBoxW #else #define MessageBox MessageBoxA #endif // !UNICODE These agnostic definitions help if you want the code to compile as both 32 bit and 64 bit without code changes.