All my fix does is change the 'MimeType=' entry to 'X-XFCE-MimeType='
(in the 3 files:  /usr/share/applications/exo-file-manager.desktop,
/usr/share/applications/exo-mail-reader.desktop ,
/usr/share/applications/exo-web-browser.desktop)

Since you have already used the broken 'exo-preferred-applications', probably 
it has put some wrong entries into your:
 ~/.local/share/applications/mimeapps.list

So do:
grep 'exo' ~/.local/share/applications/mimeapps.list

and if it finds any such entries, please open that file and delete them 
manually, save the file and then do:
update-desktop-database

That (deleting the entries in mimeapps.list + installing my PPA's exo-
utils) should fix everything.

So my fix is a kinda preventing users that never started 
'exo-preferred-applications'....
If they had already used it, a manual delete of all exo entries in 
~/.local/share/applications/mimeapps.list is needed and then update of desktop 
database...

And please never use Nautilus for opening files from command line... It will 
not open them... It opens only folders...
Use gnome-open, xdg-open, exo-open or kde-open (best choice is xdg-open that is 
a desktop sensitive open application) instead....

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https://bugs.launchpad.net/bugs/751374

Title:
  Dash won't open files anymore

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