> I got problem downloading files w/o extensions. These 
files
> are plain text file without any extension names. But they
> were downloaded and renamed to .html files by HTTrack. 

Err, please provide an URL, I'll check that (by the way, 
this problem is generally due to a bad MIME type sent by 
the server ; IE does post-process the file, so this is 
totally transparent ; but IE does NOT postprocess when 
using local files.)