Nikolay Sivov (@nsivov) commented about dlls/wshom.ocx/network.c:
- {
 TRACE("Interface IDispatchEx not supported - returning NULL\n");*ppv = NULL;return E_NOINTERFACE;- }
 - else if (IsEqualGUID( riid, &IID_IObjectWithSite ))
 - {
 TRACE("Interface IObjectWithSite not supported - returning NULL\n");*ppv = NULL;return E_NOINTERFACE;- }
 - else
 - { FIXME("Unknown iface %s\n", debugstr_guid(riid)); *ppv = NULL; return E_NOINTERFACE;
 
I think it's easier to make this a warning instead.