On 21 February 2010 22:30, Christian Costa <titan.co...@wanadoo.fr> wrote: > + if (IsEqualGUID(riid, &IID_IUnknown) || > + IsEqualGUID(riid, &IID_ID3DXConstantTable)) ID3DXConstantTable extends ID3DXBuffer.
> + ERR("Interface %s not found\n", debugstr_guid(riid)); Not implementing a random interface an application asks for is hardly an internal error. You could argue for making it a FIXME, but I think WARN is most appropriate.