To replace file manager in freya:
Install other file manager, for example nautilus
.
sudo apt-get install nautilus
To distinguish between Pantheon-files and nautilus, and to show nautilus in applications launcher:
sudo nano /usr/share/applications/nautilus.desktop
In [desktop entry]:
Change Name
and OnlyShowIn
entries to
Name=Nautilus Files
OnlyShowIn=GNOME;Unity;Pantheon;
You can easily modify file manager from GUI:
System settings --> applications --> default -->
To identify the current file manager:
xdg-mime query default inode/directory
See man xdg-mime
for more info.
To set nautilus as default file manager:
xdg-mime default nautilus.desktop inode/directory application/x-gnome-saved-search.
For Nemo