This file is indexed.

/usr/share/tcltk/tcllib1.16/hook/pkgIndex.tcl is in tcllib 1.16-dfsg-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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if {![package vsatisfies [package provide Tcl] 8.5]} {
    # PRAGMA: returnok
    return
}
package ifneeded hook 0.1 [list source [file join $dir hook.tcl]]