This file is indexed.

/usr/lib/blt2.5/init.tcl is in tk8.6-blt2.5 2.5.3+dfsg-3.

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

The actual contents of the file can be viewed below.

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namespace eval ::blt {

    proc initializeLibrary {} {
        foreach w {Button Checkbutton Radiobutton Menubutton Label Scrollbar} {
           foreach i [bind $w] {
               bind B$w $i [bind $w $i]
           }
        }
    }

    if {[info commands tk] == "tk"} {
	initializeLibrary
    }
    
}