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I'm looking for a lightweight program that can display graphics and text files, to replace built-in doublecommander viewer (f3). Can you recommend something please?
The standard solution is to use the standard file manager (Files alias nautilus in standard Ubuntu) and let it select what program to use, when you double-click on a file. I think that for this reason, there is no big incentive to create the kind of combo file reader, that you want.
emacs
(I have emacs24 (version 24.5+1-6ubuntu1) from the repositories in 16.04.1 LTS).