This file is indexed.

/usr/lib/tcltk/expect5.45/pkgIndex.tcl is in expect 5.45-5ubuntu1.

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] 8.6]} {return}
package ifneeded Expect 5.45 \
    [list load [file join /usr lib libexpect.so.5.45]]