/usr/share/doc/texlive-doc/otherformats/xmltex/base/testascii.cfg is in texlive-htmlxml 2015.20160320-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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\ActivateASCII{1}
\ActivateASCII{2}
\ActivateASCII{3}
\ActivateASCII{4}
\ActivateASCII{5}
\ActivateASCII{6}
\ActivateASCII{7}
\ActivateASCII{8}
\ActivateASCII{9}
\ActivateASCII{0}
\ActivateASCII{11}
\ActivateASCII{12}
\ActivateASCII{13}
\ActivateASCII{14}
\ActivateASCII{15}
\ActivateASCII{16}
\ActivateASCII{17}
\ActivateASCII{18}
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\ActivateASCII{20}
\ActivateASCII{21}
\ActivateASCII{22}
\ActivateASCII{23}
\ActivateASCII{24}
\ActivateASCII{25}
\ActivateASCII{26}
\ActivateASCII{27}
\ActivateASCII{28}
\ActivateASCII{29}
\ActivateASCII{30}
\ActivateASCII{31}
\ActivateASCII{32}
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\ActivateASCII{34}
\ActivateASCII{35}
\ActivateASCII{36}
\ActivateASCII{37}
\ActivateASCII{38}
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\ActivateASCII{30}
\ActivateASCII{31}
\ActivateASCII{32}
\ActivateASCII{33}
\ActivateASCII{34}
\ActivateASCII{35}
\ActivateASCII{36}
\ActivateASCII{37}
\ActivateASCII{38}
\ActivateASCII{39}
\ActivateASCII{40}
\ActivateASCII{41}
\ActivateASCII{42}
\ActivateASCII{43}
\ActivateASCII{44}
\ActivateASCII{45}
\ActivateASCII{46}
\ActivateASCII{47}
\ActivateASCII{48}
\ActivateASCII{49}
\ActivateASCII{50}
\ActivateASCII{51}
\ActivateASCII{52}
\ActivateASCII{53}
\ActivateASCII{54}
\ActivateASCII{55}
\ActivateASCII{56}
\ActivateASCII{57}
\ActivateASCII{58}
\ActivateASCII{59}
\ActivateASCII{60}
\ActivateASCII{61}
\ActivateASCII{62}
\ActivateASCII{63}
\ActivateASCII{64}
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\ActivateASCII{66}
\ActivateASCII{67}
\ActivateASCII{68}
\ActivateASCII{69}
\ActivateASCII{70}
\ActivateASCII{71}
\ActivateASCII{72}
\ActivateASCII{73}
\ActivateASCII{74}
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\ActivateASCII{76}
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\ActivateASCII{78}
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\ActivateASCII{80}
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\ActivateASCII{82}
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\ActivateASCII{84}
\ActivateASCII{85}
\ActivateASCII{86}
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\ActivateASCII{88}
\ActivateASCII{89}
\ActivateASCII{90}
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\ActivateASCII{92}
\ActivateASCII{93}
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\ActivateASCII{95}
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\ActivateASCII{97}
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\ActivateASCII{101}
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\ActivateASCII{103}
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\ActivateASCII{105}
\ActivateASCII{106}
\ActivateASCII{107}
\ActivateASCII{108}
\ActivateASCII{109}
\ActivateASCII{110}
\ActivateASCII{111}
\ActivateASCII{112}
\ActivateASCII{113}
\ActivateASCII{114}
\ActivateASCII{115}
\ActivateASCII{116}
\ActivateASCII{117}
\ActivateASCII{118}
\ActivateASCII{119}
\ActivateASCII{120}
\ActivateASCII{121}
\ActivateASCII{122}
\ActivateASCII{123}
\ActivateASCII{124}
\ActivateASCII{125}
\ActivateASCII{126}
\ActivateASCII{127}
\UnicodeCharacter{105}{\textcolor{red}{i}}
\UnicodeCharacter{97}{\textcolor{red}{a}}
\UnicodeCharacter{101}{\textcolor{red}{e}}
\UnicodeCharacter{105}{\textcolor{red}{i}}
\UnicodeCharacter{111}{\textcolor{red}{o}}
\UnicodeCharacter{117}{\textcolor{red}{u}}
\UnicodeCharacter{48}{\textzerooldstyle}
\UnicodeCharacter{49}{\textoneoldstyle}
\UnicodeCharacter{50}{\texttwooldstyle}
\UnicodeCharacter{51}{\textthreeoldstyle}
\UnicodeCharacter{52}{\textfouroldstyle}
\UnicodeCharacter{53}{\textfiveoldstyle}
\UnicodeCharacter{54}{\textsixoldstyle}
\UnicodeCharacter{55}{\textsevenoldstyle}
\UnicodeCharacter{56}{\texteightoldstyle}
\UnicodeCharacter{57}{\textnineoldstyle}
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