Hi, I've built a complete help with topics, subtopics, etc. When I use Westwind to build an output, the help file works correctly with two separate windows (index on the left side and the help content on the right side of the window). But when I try to open the file "index.htm" as file:///C:/Users/example/example.../index.htm with an internet browser, it just shows the help content without the index on the left side as a separate window (explorer, chrome, edge...). I don´t know if there is a tool to build the help file with the index on the left side or I am just opening it wrong. Thanks!

You need to run the index.htm as a Web site, not through the file system as the table of contents is loaded dynamically which doesn't work through file:/// urls. If you push this to a Web site, or you locally run it through a Web server (in Help Builder click on Open HTML Project in Web Browser) it'll work properly because the table of contents can be loaded through the XHR call that retrieves it.

IOW, if you publish the site to a Web site it'll work properly...

+++ Rick ---