Sorry Xavier. I often get confused due to the (great) many 
options in your program. I used the command line:

httrack -O g:\try 
<http://www.frc.ri.cmu.edu/~mcm/chapt.html> -* +*.png +*.gif 
+*.jpg +*.css +*.js

This doesn't fix the links. 

But if I use:

httrack -r2 -O g:\try 
<http://www.frc.ri.cmu.edu/~mcm/chapt.html> +*.png +*.gif 
+*.jpg +*.css +*.js

Not knowing much about html, does this mean it is 
depending on another html file somewhere on the site, 
which I filtered with "-*"