This file is indexed.

/usr/lib/treectrl2.2.8/pkgIndex.tcl is in tktreectrl 2.2.8-1ubuntu1.

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

The actual contents of the file can be viewed below.

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if {[catch {package require Tcl 8.5}]} return
set script ""
if {![info exists ::env(TREECTRL_LIBRARY)]
    && [file exists [file join $dir treectrl.tcl]]} {
    append script "set ::treectrl_library \"$dir\"\n"
}
append script "load \"[file join $dir libtreectrl2.2.so]\" treectrl"
package ifneeded treectrl 2.2.8 $script