Name: Altap Salamander
License: Freeware, including all plugins, for both commercial and non-commercial use
Description: Altap Salamander is a fast and reliable two-panel file manager with an intuitive interface, viewers for all popular file formats as well as support for common archives, and has built-in FTP and SFTP clients.
Other: Registry entries under HKCU\Software\Altap
BTW, Converting this Program to PortableApps format should be pretty easy,
since it actually only leaves registry keys behind and nothing else, AFAIK.
It's one of the best file managers of all times and was a commercial product until the middle of last year. Now it's freeware!
It really looks good.
I hope someone will pull it out.
BTW, Altap Salamander was formerly also known as Servant Salamander.