This file is indexed.

/usr/share/xindy/tex/inputenc/cp437.xdy is in xindy-rules 2.4-1.3.

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

The actual contents of the file can be viewed below.

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;; this file was generated by make-inp-rules.pl
;; these rules map inputenc generated macros (back) to 8-bit characters

(merge-rule "\c C" "�" :string)
(merge-rule "\~"u" "�" :string)
(merge-rule "\'e" "�" :string)
(merge-rule "\^a" "�" :string)
(merge-rule "\~"a" "�" :string)
(merge-rule "\`a" "�" :string)
(merge-rule "\r a" "�" :string)
(merge-rule "\c c" "�" :string)
(merge-rule "\^e" "�" :string)
(merge-rule "\~"e" "�" :string)
(merge-rule "\`e" "�" :string)
(merge-rule "\IeC {\~"\i }" "�" :string)
(merge-rule "\IeC {\^\i }" "�" :string)
(merge-rule "\IeC {\`\i }" "�" :string)
(merge-rule "\~"A" "�" :string)
(merge-rule "\r A" "�" :string)
(merge-rule "\'E" "�" :string)
(merge-rule "\IeC {\ae }" "�" :string)
(merge-rule "\IeC {\AE }" "�" :string)
(merge-rule "\^o" "�" :string)
(merge-rule "\~"o" "�" :string)
(merge-rule "\`o" "�" :string)
(merge-rule "\^u" "�" :string)
(merge-rule "\`u" "�" :string)
(merge-rule "\~"y" "�" :string)
(merge-rule "\~"O" "�" :string)
(merge-rule "\~"U" "�" :string)
(merge-rule "\IeC {\textcent }" "�" :string)
(merge-rule "\IeC {\pounds  }" "�" :string)
(merge-rule "\IeC {\textyen }" "�" :string)
(merge-rule "\IeC {\textpeseta }" "�" :string)
(merge-rule "\IeC {\textflorin }" "�" :string)
(merge-rule "\'a" "�" :string)
(merge-rule "\IeC {\'\i }" "�" :string)
(merge-rule "\'o" "�" :string)
(merge-rule "\'u" "�" :string)
(merge-rule "\~~n" "�" :string)
(merge-rule "\~~N" "�" :string)
(merge-rule "\IeC {\textordfeminine }" "�" :string)
(merge-rule "\IeC {\textordmasculine }" "�" :string)
(merge-rule "\IeC {\textquestiondown }" "�" :string)
(merge-rule "\lnot " "�" :string)
(merge-rule "\IeC {\textonehalf }" "�" :string)
(merge-rule "\IeC {\textonequarter }" "�" :string)
(merge-rule "\IeC {\textexclamdown }" "�" :string)
(merge-rule "\IeC {\guillemotleft }" "�" :string)
(merge-rule "\IeC {\guillemotright }" "�" :string)
(merge-rule "\alpha " "�" :string)
(merge-rule "\beta " "�" :string)
(merge-rule "\Gamma " "�" :string)
(merge-rule "\pi " "�" :string)
(merge-rule "\Sigma " "�" :string)
(merge-rule "\sigma " "�" :string)
(merge-rule "\mu " "�" :string)
(merge-rule "\gamma " "�" :string)
(merge-rule "\Phi " "�" :string)
(merge-rule "\theta " "�" :string)
(merge-rule "\Omega " "�" :string)
(merge-rule "\delta " "�" :string)
(merge-rule "\infty " "�" :string)
(merge-rule "\phi " "�" :string)
(merge-rule "\varepsilon " "�" :string)
(merge-rule "\cap " "�" :string)
(merge-rule "\equiv " "�" :string)
(merge-rule "\pm " "�" :string)
(merge-rule "\geq " "�" :string)
(merge-rule "\leq " "�" :string)
(merge-rule "\div " "�" :string)
(merge-rule "\approx " "�" :string)
(merge-rule "\IeC {\textdegree }" "�" :string)
(merge-rule "\IeC {\textperiodcentered }" "�" :string)
(merge-rule "\IeC {\textbullet }" "�" :string)
(merge-rule "{\mathchar ~"1270}" "�" :string)
(merge-rule "{^n}" "�" :string)
(merge-rule "{^2}" "�" :string)
(merge-rule "\IeC {\textblacksquare }" "�" :string)
(merge-rule "\IeC {\nobreakspace  }" "�" :string)

;; end of style file.