Default File Manager Change -(Trinity Desktop)

 

and 

/opt/trinity/share/applications

change mimeinfo.cache

inode/directory=tde-kfmclient_dir.desktop;tde-filelight.desktop;tde-cervisia.desktop;

changed

or

xdg-mime default d3lphin.desktop inode/directory

xdg-mime query default inode/directory

and

To make dolphin the default file manager.,

~/.local/share/applications/tde-d3lphin.desktop

and

/opt/trinity/share/applications/tde/d3lphin.desktop

And change the line:

 Exec=d3lphin %i -caption "%c" "%u" 

To this:

 Exec=d3lphin %i -caption %c %u