> I have a question : Can you use this software to study it 
> source code to integrate it to the HTTrack Website copier 
> to permit it to download swf sites ?
No - memoweb is a commercial, closed-source product, and I 
can't "study" the code.

The only available library for the proprietary, closed-
source SWF format, is the "official" Macromedia library, 
used by HTTrack. But despite a non-free license longer than 
the sourcecode itself, this library is fair and bogus, and 
does not allow any modifications inside the SWF file, and 
even crashes on valid SWF files time to time (!)