/etc/texmf/fmt.d/10texlive-xetex.cnf is in texlive-xetex 2013.20140215-1.
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 6 7 8 9 | # 10texlive-xetex.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 -_-
#
xetex xetex language.def -etex xetex.ini
xelatex xetex language.dat -etex xelatex.ini
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