> How can I make a copy of of non .com; .org; .net; ect. 
> Domains. For example an URL within an intranet or 
extranet? 
> They usually don't use 'regular' domains.

It does not matter - httrack rely on "Internet address", 
which also includes intranet addresses. Once you can reach 
a webserver (internal) with a regular browser, the same 
address will (should) work also with httrack.