This file is indexed.

/usr/lib/os-probes/mounted/80minix is in os-prober 1.65+deb8u1.

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
set -e

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

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

# Weed out stuff that doesn't apply to us
case "$type" in
	minix|minix2|ext2) ;;
	*) exit 1 ;;
esac

if [ -f "$dir/minix" ] || [ -e "$dir/boot/image_big" ]; then
	if [ -e "$dir/boot/image_latest" ]; then
		boot="minix"
	else
		boot="chain"
	fi

	label="$(count_next_label Minix)"
	result "$partition:Minix:$label:$boot"
	exit 0
else
	exit 1
fi