This file is indexed.

/usr/share/rr/64bit-linux.xml is in rr 5.1.0-1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<!-- Copyright (C) 2010-2014 Free Software Foundation, Inc.

     Copying and distribution of this file, with or without modification,
     are permitted in any medium without royalty provided the copyright
     notice and this notice are preserved.  -->

<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.i386.linux">
  <reg name="orig_rax" bitsize="64" type="int" regnum="57"/>
</feature>