/usr/lib/tcltk/Tkhtml3.0/pkgIndex.tcl is in tk-html3 3.0~fossil20110109-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | package ifneeded Tkhtml 3.0 [list load [file join $dir libTkhtml3.0.so]]
package ifneeded hv3 0.1 [list source [file join $dir hv3-0.1.tm]]
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