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/etc/texmf/fmt.d/10texlive-math-extra.cnf is in texlive-math-extra 2009-10ubuntu1.

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The actual contents of the file can be viewed below.

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# 10texlive-math-extra.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 -_-
# 
amstex pdftex - -translate-file=cp227.tcx *amstex.ini