openfile helps open a file with xdg-open from mutt/neomutt in a external program without weird side
effects.
It aims to be as simple and functional as possible for the user to associate a file extension with the
program that will open it.
It is not necessary to configure a specific program for each extension in mutt/neomutt, because this
association will come from your environment settings, controlled by xdg-open.
This program ends up not being exclusive to mutt/neomutt, it can be used by command line in a terminal by
the user to open any file in its respective default program, just by using the command as described in
the Synopsis field.