This file is indexed.

/etc/acpi/events/thinkpad-volume-down is in acpi-support 0.142-8.

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

The actual contents of the file can be viewed below.

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# Volume Down
event=ibm/hotkey HKEY 00000080 00001016
action=/etc/acpi/voldownbtn.sh