/usr/share/doc/iwidgets4-doc/demos/extfileselectionbox is in iwidgets4-doc 4.0.1-6.
This file is owned by root:root, with mode 0o644.
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# DEMO: extfileselectionbox in [incr Widgets]
# ----------------------------------------------------------------------
package require Iwidgets 4.0
option add *textBackground seashell
iwidgets::extfileselectionbox .fsb -width 4i -height 4i
pack .fsb
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