Проект закрывается после создания

#include "stdafx.h"
#include "Standart.h"
 
#define MAX_LOADSTRING 100
 
HINSTANCE hInst;
 
TCHAR szTitle[MAX_LOADSTRING];
TCHAR szWindowClass[MAX_LOADSTRING];
 
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
 
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                       LPTSTR lpCmdLine, int nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);
 
    MSG msg;
    HACCEL hAccelTable;
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_STANDARD, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);
    if (!InitInstance(hInstance, nCmdShow))
    {
        return FALSE;
    }
    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_STANDARD));
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
 
    return (int)msg.wParam;
}
 
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;
 
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_STANDARD));
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wcex.lpszMenuName = MAKEINTRESOURCE(IDC_STANDARD);
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
 
    return RegisterClassEx(&wcex);
}
 
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hwnd;
    hInst = hInstance;
    hwnd = CreateWindow(szWindowClass, szTitle, WS_SYSMENU|WS_VISIBLE|WS_MINIMIZEBOX|WS_MAXIMIZEBOX,
        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
 
    if (!hwnd)
    {
        MessageBeep(-1);
        return FALSE;
    }
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    return TRUE;
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
 
    switch(message)
    {
    case WM_COMMAND:
        wmId = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        switch(wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hwnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hwnd);
            break;
        default:
            return DefWindowProc(hwnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        EndPaint(hwnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    
    return 0;
}
 
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch(message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;
    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}