There are two WebBrowser in the first load html structure
<ul> <a href"..."><li>1 пункт</li></a> <a href"..."><li>2 пункт</li></a> <a href"..."><li>3 пункт</li></a> </ul> And there is a second WebBrowser in which, when you click on an item in the first WebBrowser, the file to which the item link leads will be displayed
Something like this:

*.chmfiles. - Alex Krass