The "Portable 16" you mention is almost certainly an created by third parties to run from a USB drive without installation, possibly with an altered version number to appear newer.

Would you like a safe, legal alternative list instead?

However, I must clarify: , nor a version labeled "16". The last official version was Microsoft FrontPage 2003 (part of Office 2003 suite), and it was discontinued years ago (replaced by SharePoint Designer and Expression Web).

It looks like you're looking for (description, features, or technical details) for something called "Microsoft FrontPage 2003 Portable 16" .