Method of IApplication
Register Icon from Application binary resource (can be bitmap, PNG or Icon of any size)
var pnIcon = Application.RegisterImageResource(hResourceInstance, nResourceID, sResourceType);
pnIcon = Application.RegisterImageResource hResourceInstance, nResourceID, sResourceType
long nIcon; HRESULT hr = Application.RegisterImageResource(hResourceInstance, nResourceID, sResourceType, &nIcon);