This file is indexed.

/usr/share/tcltk/tcl8.5/Tix8.4.3/pkgIndex.tcl is in tix 8.4.3-4ubuntu1.

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 8.4}]} return
package ifneeded Tix 8.4.3 \
    [list load [file join /usr/lib libTix8.4.3.so.1] Tix]