/usr/share/help/C/latexila/index.page is in latexila-data 3.16.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | <page xmlns="http://projectmallard.org/1.0/"
type="guide"
id="index">
<title>LaTeXila Help</title>
</page>
|