Ubuntu – Does Synapse use Nautilus for all file types instead of the default application

filemanagernautilussynapsexdg-open

No matter which file I find via Synapse, it just gets opened in Nautilus. May that be because I recently put Nautilus as my default file manager?

Can I change that behavior to the normal action, i.e. an .ods file gets opened with LibreOffice Calc, .txt with Mousepad… and so on?

Additional information:

I am running Xubuntu 13.10.