well I found why I couldn't retrieve other type than html 
in the first url.

I used the -p0 option to check link only but it seems that 
prevent non-html downloading ...
Now it works fine but it save the file on the disk and I 
don't want it. (that's why I used -p0)

So I need htttack to get any type of file to parse them BUT 
not save them... 
Why, why, why  life is so complex ???  :-)

furthermore I still have my local file fetching problem ... 
(see my other posts )

Thank you for your help.