MuCommander
Orthodox 2 panel file manager for Macintosh
muCommander is a lightweight, open-source, cross-platform file manager that will run on any operating system supporting Java. It features a Norton Commander style, dual-pane interface to allow easy manipulation of files with many keyboard shortcuts.
Fixes problems, such as easily connect a Mac to a Windows network share.
Install muCommander. Tested on Catalina using muCommander version 0.9.5
If installing from muCommander web site and not the Apple App Store it is necessary to override security permissions for installation.
muCommander uses a working implementation of CIFS / SMBv1.0 and can access shares on older NAS devices from a Macintosh computer.
Troubleshooting
cannot be opened because it was from an unidentified developer
Gatekeeper is a macOS security feature that only lets you open Apple-trusted software. It may present to you a message that “macOS cannot verify that this app is free from malware."
(A) you can bypass Gatekeeper restrictions by control-clicking the application and selecting Open from the pop-up menu. A new alert warns you the software is unverified by Apple and may contain malicious software, but you can still choose to Open it anyway. -or-
(B) Apple -> System Preferences -> Security and Privacy (icon) ->