/usr/share/tcltk/tcllib1.18/page/plugins/ is in tcllib 1.18-dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/tcltk/tcllib1.18/page/plugins/config_peg.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/pkgIndex.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/reader_hb.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/reader_lemon.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/reader_peg.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/reader_ser.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/reader_treeser.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/transform_mecpu.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/transform_reachable.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/transform_realizable.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_hb.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_identity.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_me.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_mecpu.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_null.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_peg.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_ser.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_tpc.tcl
/usr/share/tcltk/tcllib1.18/page/plugins/writer_tree.tcl