/usr/share/saods9/blt3.0/filmstrip.tcl is in saods9-blt 7.2+dfsg-4.
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 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51  | namespace eval blt::Filmstrip {
    set buttonPressed 0
    proc Initialize {} {
    }
}
bind FilmstripHandle <Enter> { 
    if { !$blt::Filmstrip::buttonPressed } { 
	%W activate 
    } 
} 
bind FilmstripHandle <Leave> { 
    if { !$blt::Filmstrip::buttonPressed } { 
	%W deactivate
    } 
}
bind FilmstripHandle <KeyPress-Left> { 
    %W move -10 0 
}
bind FilmstripHandle <KeyPress-Right> { 
    %W move 10  0 
}
bind FilmstripHandle <KeyPress-Up> { 
    %W move 0 -10 
}
bind FilmstripHandle <KeyPress-Down> { 
    %W move 0 10 
}
bind FilmstripHandle <Shift-KeyPress-Left> { 
    %W move -100 0 
}
bind FilmstripHandle <Shift-KeyPress-Right> { 
    %W move 100  0 
}
bind FilmstripHandle <Shift-KeyPress-Up> { 
    %W move 0 -100 
}
bind FilmstripHandle <Shift-KeyPress-Down> { 
    %W move 0 100
}
bind FilmstripHandle <ButtonPress-1> { 
    set blt::Filmstrip::buttonPressed 1
    %W anchor %X %Y 
}
bind FilmstripHandle <B1-Motion> { 
    %W mark %X %Y 
}
bind FilmstripHandle <ButtonRelease-1> { 
    set blt::Filmstrip::buttonPressed 0
    %W set %X %Y 
}
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