/usr/lib/tcltk/x86_64-linux-gnu/tkmpeg1.0/pkgIndex.tcl is in tk-mpeg 1.0.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #
# Tcl package index file
#
package ifneeded tkmpeg 1.0 \
[list load [file join $dir libtkmpeg1.0.so] tkmpeg]
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