Since I installed EasyTag on my Arch Linux several other programs use EasyTag instead of Nautilus as filebrowser.
For example, Firefox starts EasyTag if I click on "open containing folder".
Where can I set Nautilus as my "standard file browser"?
You can define the default file browser by editing the file
~/.local/share/applications/mimeapps.list. Open this file and change the line
inode/directory as follow
If this doesn't work, you should change the filemanager in the file
by adding (or updating) this line
You can find a comprehensive description of setting up default applications here in the according Arch wiki article.
For your specific case, you edit
~/.config/mimeapps.list and add a new line with
inode/directory=nautilus.desktop to the section
The file should look similar to the following one:
[Default Applications] text/plain=SciTE.desktop text/x-tex=texmaker.desktop inode/directory=nautilus.desktop
The following command solved this problem in arch linux:
xdg-mime default nautilus.desktop inode/directory
(Source: Arch Forums)