I'm just guessing, but I think since those files are not inside HTML tags like
<a> or <img> it ignores them.

You might try the following (from the manual)...

Links options:
 %P *extended parsing, attempt to parse all links, even in unknown tags or
Javascript (%P0 don't use) (--extended-parsing[=N])

I don't know, but it might look at any tag it finds, see if there's a link
inside it and if there is, then try to download that file.