Also, you can override the two files with information that will be presented to the user before and after the installation. To do that, check the Information text before installing or the Information text after installing and enter a file in the text fields below. You can also click the chooser buttons [...] to select the files in a file chooser. The text in the information files may be plain text or formatted in HTML.

You could achieve the same effect by using user variables, but this step makes file selection more transparent and converts your entries to relative files if the corresponding project option has been enabled.