Usually, the icon overlay used for a file extension is taken from the default icon assigned by the application currently associated with that file extension.
You can override this behavior and use a specific icon to help you more readily recognize your files when they are in thumbnail view.
This is particularly useful when you have "Hide extensions for known file types" enabled in the Explorer folder options.
Tip: File icon libraries are often found in the default application's main executable for a given file format.
Tip: If the global option Enable Icon Overlays is disabled, this section will also be disabled.
This allows you to select and override a specific icon for file extension(s).
Single clicking enables or disables the icon overlay override option. A enabled or disabled icon is overlaid on the icon upper right.
Double clicking this button opens the choose icon window allowing you to select an application, library or icon file that contains the desired icon to use for the given file extension. See Here.
Revert to default (hold Ctrl key) to revert the icon to the default state.
When forcefully disabling the overlay icon, the icon overlay for this file extension is explicitly removed. Useful if you do not want an icon overlay for a particular image type. Any previous assigned icon overlay is forgotten.
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