This file is indexed.

/etc/X11/Xsession.d/70gtk3-nocsd-propagate-LD_PRELOAD is in gtk3-nocsd 3-1.

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

The actual contents of the file can be viewed below.

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# This file is sourced by Xsession(5), not executed.

# Some other startup programs may drop LD_PRELOAD as environment
# variable (ssh-agent is known for this), so make sure it's set
# explicitly again AFTER ssh-agent has been called.
if [ -n "$LD_PRELOAD" ] ; then
    STARTUP="env LD_PRELOAD=$LD_PRELOAD $STARTUP"
fi