/etc/X11/Xsession.d/25ubuntustudio-menu is in ubuntustudio-menu 0.15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/bin/sh
#
BASE_DIR="/usr/share/ubuntustudio-menu/"
export XDG_CONFIG_DIRS="${BASE_DIR}":/etc/xdg/
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