This file is indexed.

/usr/lib/blt2.4/dd_protocols/tclIndex is in blt 2.4z-4.2ubuntu1.

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

The actual contents of the file can be viewed below.

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# Tcl autoload index file, version 2.0
# This file is generated by the "auto_mkindex" command
# and sourced to set up indexing information for one or
# more commands.  Typically each line is a command that
# sets an element in the auto_index array, where the
# element name is the name of a command and the value is
# a script that loads the command.

set auto_index(dd_send_file) "source $dir/dd-file.tcl"
set auto_index(dd_send_text) "source $dir/dd-text.tcl"
set auto_index(dd_send_number) "source $dir/dd-number.tcl"
set auto_index(dd_send_color) "source $dir/dd-color.tcl"