The command in the product structure view to open up a WTDocument in Creo View tries to open the default file in Creo View. This leads most of the time to errors because the main file is not always a type which can be opened directly in Creo View e.g. docx, pptx, etc. The command "Open in Creo View" should actually opens the visualization rather than the primary file.
The answer from the technical support is "Works as expected for Windchill PDMLink 11.0" (Also for 10.2) . I belief this is actually wrong to open up a new product idea because this command is already there, just the behavior is wrong.