Case sensitive filenames

Windows treats filenames case-insensitive by default but according to
msdn that can be changed. I created the files "TEST.txt" and "test.txt"
from Linux in my NTFS partition. Then I wrote a little test program to
read them from Windows. But in all three cases only the first file is
beeing read, as if FILE_FLAG_POSIX_SEMANTICS doesn't affect anything;

::Read(_T("TEST.txt"));
::Read(_T("test.txt"));
::Read(_T("Test.txt"));

void Read (LPTSTR name)
{
    CString s;
    DWORD dwRead;
    char buf[100];

    HANDLE h = ::CreateFile( name,
                   GENERIC_READ,
                   FILE_SHARE_READ,
                   NULL,
                   OPEN_EXISTING,
                   FILE_ATTRIBUTE_ARCHIVE | FILE_FLAG_POSIX_SEMANTICS,
                   NULL );

    if (h == INVALID_HANDLE_VALUE)
    {
       s.Format(_T("Error: %d"), GetLastError());
       AfxMessageBox(s);
       return;
    }

    ReadFile(h, buf, sizeof(buf), &dwRead, NULL);
    *(buf + dwRead) = '\0';
    CloseHandle(h);
}

What's wrong here?

Hans