#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <windowsx.h>


int WINAPI WinMain( HINSTANCE hInstance, 
                    HINSTANCE hPrevInstance, 
                    LPSTR lpCmdLine, 
                    int nShowCmd){
    MessageBox(NULL, "正文!!",
                     "标题",
                     MB_OK | MB_ICONEXCLAMATION);
}

我已将文件编码设置为utf8，结果还是出现乱码，这是为何？