net461 
namespace System.Workflow.ComponentModel.Design
{
    [Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
    public abstract class WorkflowDesignerMessageFilter : IDisposable
    {
        protected WorkflowDesignerMessageFilter();
    }
}
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.NET Framework
3.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net461
Assembly

System.Workflow.ComponentModel , Version=4.0.0.0, PublicKeyToken=31bf3856ad364e35

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Your project needs an assembly reference to System.Workflow.ComponentModel.

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