If you want to link to a folder you will need to use a valid URL path to the folder such as the following:
file://C:/Program Files/Netblender/Intellidisc
This will link to the Intellidisc foler. Here are the steps:
1. Select the Menu Button you want to apply the behavior to.
2. Use the HTML Behavior: “Open Browser Window”
3. Then the URL like the one above: “file://C:/Program Files/Netblender/Intellidisc”.
(you don’t have to set the size or position only if you want.)
That is it.