Edrawing open file - thumbnail view Solidworks files.

I have several other people in the company who are using Edrawing to view Solidwork drawings and 3D models.  When they go to open solidworks files there is no thumbnail view of the solidworks files.  Both on Windows 7 and Vista machines.  Why cann't Edrawings display the thumbnail in Solidwork files?  Is it possible to fix, maybe a setting I missing?  Please see the attached jpg file for reference.

regards,

Stan

SolidworksEdrawings