From the help files, regarding the format of ListView lines:
state# Index of the state icon to use from the ListView's state image list. State images are displayed to the left of the main icon. The checkboxes style automatically creates two state images on its own and uses these to simulate checkboxes for items. When the checkboxes style is enabled, items may only have state icons 1 (unchecked) and 2 (checked). Otherwise, you may use 0 to indicate no state icon. All icons must be added with the seticon command before they can be used.
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