> How can I set httrack to download files with full name, 
> query and extensions? Currently my httrack hash the 
query, 
> I don't know how to disable that?
You can't include the query string into the local saved 
file, mainly because specific characters like ? or & can 
not be used as filesystem character (the same goes for many 
other characters commonly encounetered in query string and 
parameters)

You can avoid query string hasing by modifying the "user-
defined structure" (see options) ; and you can avoid 
extension modification by unactivating the Spider/Check 
document type/ = Never

> Also the example in the 'User-defined structure' only 
shows 
> how to set the structure for a particular file type. If I 
> want to define a different structure for different file 
> type, how can I do that?
You can't for now - I don't know if this will be added in 
the future, as this is a very specific use. You can also, 
if you're a programmer, hack the htsname.c routine and 
change the url_savename() function :)