/usr/lib/tcltk/owtcl-1.0/pkgIndex.tcl is in libow-tcl 2.8p15-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | if {[catch {package require Tcl 8.1}]} return
package ifneeded ow 1.0\
[list load [file join $dir ow.so] ow]
|