From the Knowledge Base:
Product:SolidWorks Enterprise PDM 2011 CAD Editor
Question:In SolidWorks Enterprise PDM, workflow icons (state columns) are not visible when using Microsoft® Windows® Explorer (Details view), but are visible when using the search tool, why?
Answer:Unfortunately, this is a known limitation since Microsoft Windows Explorer does not support having icons in detail view display mode.
Thanks Jim. It's not the answer I wanted to see, but it IS an answer!