CFile::GetStatus 获取文件大小有问题

// get just the low DWORD of the file size
ASSERT(findFileData.nFileSizeHigh == 0);
rStatus.m_size = (LONG)findFileData.nFileSizeLow;

BOOL GetFileSize(CString strFilePath, ULONGLONG& nFileSize)
{
	HANDLE hFile = CreateFile(strFilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL); 
	if(hFile == INVALID_HANDLE_VALUE) {    
		return FALSE; 
	}

	LARGE_INTEGER lFileSize;
	if(!GetFileSizeEx(hFile, &lFileSize)){
		CloseHandle(hFile);
		return FALSE;
	}

	nFileSize = lFileSize.QuadPart;
	CloseHandle(hFile);
	return TRUE;
}