This file is indexed.

/usr/lib/tcltk/tktray1.3.9/pkgIndex.tcl is in tk-tktray 1.3.9-2.

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 package index file
#
if {[package vcompare [info tclversion] 8.4] < 0} return

package ifneeded tktray 1.3.9 \
    [list load [file join $dir libtktray1.3.9.so] tktray]