An interesting open source, Java-based file manager with quite a few listed features. The installation notes include a suggestion that it might be self-contained: https://www.boarderzone.net/products/Fi ... ation.html ... Unfortunately I couldn't seem to get this one to start so I'm going to leave this in the "not portable" group.
Tested v.0.21.829
License: GPLv2
Websites:
https://www.boarderzone.net/products/Fi ... index.html
https://www.softpedia.com/get/File-mana ... wser.shtml