Re: windowscodecs: Implement MetadataHandler_GetValue.

[Vincent Povirk]

> +    case VT_I8:
> +    case VT_UI8:
> +    case VT_R8:
> +        return v1->u.uhVal.QuadPart - v2->u.uhVal.QuadPart;

Won't this only compare the low part on x86?