Well, we have gone round and round on this ...
Have you even tried to understand the scripting language of WinBuilder???
If not - that would be a good place to start. For example, in this script, they use the API command "reguire_file". There is full docs on the web, and
here is the page for that commaand. But, it is using defaults for most of the parameters, which means that the source file has to come from the windows\system32 area of the "source" image.
BUT, if you look a bit further into scripting or ANY of the tutorials, you would also see that you could just as easily add the file to the script directly as an attached file and
extract the file to a specific directory - or create an archive to attach, and
extract and unpack the archive to a given folder.
So, there are MANY ways to do this - not counting all the other ways we have documented here in the forum to add files to a PE when it is built or to the image (ISO) as it is created.
Scott