/usr/lib/libreoffice/share/extensions/writer2xhtml/desc_en.txt is in libreoffice-writer2xhtml 1.0.2-8ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | Writer2xhtml provides Writer and Calc export filters for XHTML and XHTML+MathML
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