O questionador mencionado:
So it's under \HKEY_CLASSES_ROOT\CLSID{c900ea2f-8575-4e86-bae9-f94620699414}, and the default icon is labeled as C:\Program Files\Droid Explorer\Assets\GT-I9000.ico. GT-i9000 is the model for my phone, so I guess when I uninstalled that software it left the icon behind.