win注册失败

#include <windows.h>
#pragma comment( lib,"winmm.lib")

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPervInstance,LPSTR lpCmdLine,int iCmdShow){
static TCHAR szAppName[] = TEXT("HelloWin");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.style = 0;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbClsExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if ( ! RegisterClass(&wndclass)){
MessageBox(NULL,TEXT("This program reauires Windows NT!"),szAppName,MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName,

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