Lost RC4 Icons?

Does someone know what would cause program icons to be lost?

I have recently noticed that the RC4 radar icon is no longer reflected on my desktop. The shortcut is still there, but just has default non-program icon. When I select 'properties' and 'change icon' I can see the radar icon, but when clicking 'apply' and 'OK' nothing changes.

I did have some problem opening the program (nothing happened), before the icon disappeared, but now the program still seems to open properly, but the icon has gone.

Is this a Windows issue, or a problem with the 'exe', and does anyone know how to resolve?

Stuart