Specifies a list of additional files required to support the HTML template. These can be any files that are referenced by the HTML template, such as a graphic. Author-it copies all files specified to the publishing folder when publishing HTML or HTML based Help. An error is displayed if any of these files cannot be found. Relative or fixed paths are supported.
The WebAdditionalFiles element corresponds to the "Specify any additional files required" field, on the HTML tab of the Media object.