This file is indexed.

/usr/lib/os-probes/mounted/10qnx is in os-prober 1.63ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

. /usr/share/os-prober/common.sh

partition="$1"
mpoint="$2"
type="$3"

# Weed out stuff that doesn't apply to us
case "$type" in
	qnx4) debug "$partition is a QNX4 partition" ;;
	*) debug "$partition is not a QNX4 partition: exiting"; exit 1 ;;
esac

if [ -e "$mpoint/.boot" ]; then
	label="$(count_next_label QNX)"
	result "$partition:QNX:$label:chain"
	exit 0
else
	exit 1
fi