Another component installed just fine.
I noticed that extplorer didn't have an update since 2008.
I wonder why it is listed here as compatible with 1.6 and as an editors pick??!
This is not the place to file bug reports (but http://goo.gl/tyY52). eXtplorer has been updated regularly every since and the latest release was 2 weeks ago in January 2011.
It installs fine in a standard Joomla! 1.6 release. This has been confirmed by many users.
I submitted a ticket and within 24 hours the problem was solved.
Good support, good product.
I feel so much better knowing my website is protected.
RS Firewall requires some input though, you need to adjust and finetune settings of your website in order to get a good protection grade.