> for some reason I can`t download files from
> www.ultimate-guitar.com with httrack. Can anybody

> Error:  "Open error when decompressing" (-1) at link
> www.ultimate-guitar.com/ (from primary/primary)

You'll have to override options -> spider -> spider = no robots.txt as:
User-agent: *
Disallow: /mailto.php
Disallow: /forum/showthread.php?p=
Disallow: /forum/printthread.php?t=
Disallow: /vote4.php
Disallow: /report_bad_tab.php

binary/decompressing sometimes occurs on sites that look at the browser ID of
the client and return junk to robots.
options -> browser id defaults to httrack. try changing it to Mozilla/4.0
(compatible; MSIE 5.5; Windows NT 5.0)