This file is indexed.

/usr/lib/tcltk/owtcl-1.0/pkgIndex.tcl is in libow-tcl 3.1p1-2ubuntu1.

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

The actual contents of the file can be viewed below.

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if {[catch {package require Tcl 8.1}]} return
package ifneeded ow 1.0\
     [list load [file join $dir ow.so] ow]