Donut Browser is a small Drag&Drop capable utility to view any 'cicn' resources a file may contain. 'cicn' stands for color icons, so the browser actually draws these resources in a window (at the three most common sizes).
Donut Browser has been written as a natural add-on to ePress. In fact, it lets you view the content of its icon collection Plug-ins. You can also browse a file to see if it contains any 'cicn' resources and is therefore suitable to be used as a custom icons file.