Minor improvements of Win32 code

Yuhang Zhao

2024-12-09 42977738aba59150109fea3e9edd2b74643c1000

 examples/mainwindow/mainwindow.qrc

@@ -1,5 +1,6 @@
<RCC>
    <qresource prefix="/">
        <file>dark-style.qss</file>
        <file>light-style.qss</file>
    </qresource>
</RCC>