/usr/share/tcltk/iwidgets4.0.1/pkgIndex.tcl is in iwidgets4 4.0.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Tcl package index file, version 1.0
package ifneeded Iwidgets 4.0.1 [list source [file join $dir iwidgets.tcl]]
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