This file is indexed.

/usr/lib/tkpng0.9/pkgIndex.tcl is in tkpng 0.9-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Tcl package index file
#
package ifneeded tkpng 0.9 \
    [list load [file join $dir libtkpng0.9.so] tkpng]