This file is indexed.

/etc/acpi/events/sony-mute is in acpi-support 0.142-6.

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

The actual contents of the file can be viewed below.

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# /etc/acpi/events/sony-mute

event=sony/hotkey (SPIC|SNC) 00000001 0000000d
action=/etc/acpi/mutebtn.sh