> While HTTrack does not have a Flash parser (ie, URLs 
inside a Flash file won't be followed), I have still 
found that it will download any Flash which is 
directly linked to, or embedded, on a page.
> 
> You have want to add +*.swf in the scan rules.

Almost the same problem exists for java classes: a 
binary parser is implemented, but many classes won't 
work because of rewriting problems in the class file 
(changing static string sizes in a binary class file 
is really a nightmare..)

Binary parsing is, generally, really painful..