This file is indexed.

/etc/texmf/fmt.d/40xmltex.cnf is in xmltex 1.9.debian.1-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# 40xmltex.cnf
# You can change/add entries to this file and changes will be preserved
# over upgrades, even if you have removed the main package prior
# (not if you purged it). You should leave the following pseudo comment
# present in the file!
# -_- DebPkgProvidedMaps -_-
# 
xmltex	pdftex	language.dat	&latex xmltex.ini
pdfxmltex	pdftex	language.dat	&pdflatex pdfxmltex.ini