I switched to nemo a long time ago, because I think it's superior to nautilus in many ways. One small thing bothers me however:

Whenever I want to open a document in gedit (or evince, but I'm sure there are other programs as well) not the nemo file-selection window appears but the nautilus one.

I did of course replace nemo with nautilus as suggested in a lot of other posts:

 gsettings set org.gnome.desktop.background show-desktop-icons false

and

 xdg-mime default nemo.desktop inode/directory application/x-gnome-saved-search

and also did

 ln -s /usr/bin/nemo /usr/local/bin/nautilus

in order to completely replace nautilus, but this doesn't help. Which program/executable is triggered when hitting open (Ctrl+o) in gedit/evince?