There was no version 18.104.22.168 at all.
From Release Notes (http://browser.netscape.com/ns8/support/relnotes.jsp):
The Netscape Browser
Visit the security center on http://browser.netscape.com for detailed security fixes.
What's fixed in this version?
â€¢ All security and bug fixes through Firefox 1.0.6
â€¢ A bug disabling downloads for many users
Underlining done by me