/usr/lib/tcltk/snack2.2/pkgIndex.tcl is in tcl-snack 2.2.10.20090623-dfsg-6.
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 6 7 8 9 10 11 12 13 14 15 | #
# Immediate loading of Snack because of item types etc.
#
# http://www.wjduquette.com/tcl/namespaces.html
#
package ifneeded snack 2.2 "[list load [file join $dir libsnack.so]];[list source [file join $dir snack.tcl]]"
package ifneeded sound 2.2 [list load [file join $dir libsound.so]]
package ifneeded snacksphere 1.2 [list load [file join $dir libsnacksphere.so]]
package ifneeded snackogg 1.3 [list load [file join $dir libsnackogg.so]]
package ifneeded snackmpg 1.3 [list load [file join $dir libsnackmpg.so]]
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