Скажем нет стилю win95

#include <windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE instance;
int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrevInst,LPSTR cmdline,int mode)
{
    instance=hInst;
    WNDCLASSEX wc;
    wc.cbSize=sizeof(wc);
    wc.hInstance=hInst;
    wc.lpfnWndProc=WndProc;
    wc.lpszClassName="TEST";
    wc.lpszMenuName=NULL;
    wc.style=CS_HREDRAW|CS_VREDRAW;
    wc.cbClsExtra=wc.cbWndExtra=0;
    wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wc.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
    wc.hCursor=LoadCursor(NULL,IDC_ARROW);
    wc.hbrBackground=(HBRUSH)COLOR_WINDOW;
    if (!RegisterClassEx(&wc))
    {
        MessageBox(NULL,"Can\'t register class","Error",MB_OK);
        return 1;
    }
    HWND wnd=CreateWindow("TEST","TEST",WS_OVERLAPPEDWINDOW|WS_VISIBLE,CW_USEDEFAULT,CW_USEDEFAULT,500,500,NULL,NULL,hInst,NULL);
    ShowWindow(wnd,SW_NORMAL);
    UpdateWindow(wnd);
    MSG msg;
    while (GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam)
{
    HWND btn;
    switch (msg)
    {
        case WM_CREATE:
            btn=CreateWindow("BUTTON","Button",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,10,10,100,20,hwnd,(HMENU)10001,instance,NULL);
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
    }
    return DefWindowProc(hwnd,msg,wparam,lparam);
}