/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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #!/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
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