如何修改Powershell代码，以便仅为文件而不是目录创建超链接？

I'm using the code below to generate Index.htm page. The code works great, but the only thing that I don't want inside that Index.htm page is to have the hyperlinks for directories, as they are useless. Index.htm should contain only hyperlinks to the .htm files inside the I'm using the code below to generate Index.htm