Orphaned Icon Entries
Like so many other things, the paths to file format icons and some other icon types are stored in entries in the Windows® registry. In the course of time icons sometimes get deleted or moved. If the object they refer to still exists Windows® automatically displays a standard icon instead.
More frequently both the icon and the object it refers to are moved or deleted. In both cases, the associated registry entry becomes orphaned – i.e. it refers to an object that no longer exists. These entries are completely useless and can be deleted safely.
Activating this option tells Registry Optimizer to find orphaned icon entries so that you can delete them.