/usr/lib/tkpng0.9/pkgIndex.tcl is in tkpng 0.9-1ubuntu2.
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 tkpng 0.9 \
[list load [file join $dir libtkpng0.9.so] tkpng]
|