/usr/share/doc/iwidgets4-doc/demos/checkbox is in iwidgets4-doc 4.0.1-6.
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 | # ----------------------------------------------------------------------
# DEMO: checkbox in [incr Widgets]
# ----------------------------------------------------------------------
package require Iwidgets 4.0
iwidgets::checkbox .cb -labeltext Styles
.cb add bold -text Bold
.cb add italic -text Italic
.cb add underline -text Underline
.cb select underline
pack .cb -padx 10 -pady 10 -fill both -expand yes
|