This issue occurs as the MS word doc type is not selected in the PWviewer.cfg file in the Programfilesx86>bentley>projectwise>bin
This feature comes default with the projectwise and in order to enable it please follow below PW help link -
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https://docs.bentley.com/LiveContent/web/ProjectWise%20Explorer%20Help-v11/en/GUID-FE6015E0-D88E-876B-358F-BA0EBE96992E.html
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