/usr/lib/calamares/modules/users/module.desc is in calamares 3.1.12-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Syntax is YAML 1.2
---
type: "viewmodule"
name: "users"
interface: "qtplugin"
load: "libcalamares_viewmodule_users.so"
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