This file is indexed.

/etc/xdg/xdg-ubuntustudio/xfce4/helpers.rc is in ubuntustudio-default-settings 0.64.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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WebBrowser=firefox
MailReader=thunderbird
FileManager=Thunar
TerminalEmulator=xfce4-terminal