/usr/share/tcltk/tls1.6.7/pkgIndex.tcl is in tcl-tls 1.6.7+dfsg-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | package ifneeded tls 1.6.7 \
"[list source [file join $dir tls.tcl]] ; \
[list tls::initlib /usr/lib libtls1.6.7.so]"
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