You are able to see thumbnails of Creo Illustrate illustrations in Windchill Workgroup Manager.

Thumbnail generation and the thumbnail worker (pvsthumb) are covered in the Creo View™ MCAD Adapters Installation and Configuration Guide.

The Thumbnail Navigator and the Mini-Thumbnail (Windchill) are covered in the Windchill Help Center. Thumbnail navigation is found in the Mini-information Window. The Windchill Visualization Services content is part of the Windchill Help Center and is also collected topically in the Windchill Visualization Services Administrator’s Guide (PDF only).