Need a thumbnail viewer for rhino 5 windows 7 x64

can someone point me to a source for thumbnail viewer for rhino5 win 7 x64?

A thumbnail viewer for Rhino 5 x64 comes with Rhino 5. Are you not seeing thumbnails?

yes, I am seeing them, I forgot to set my viewer to see them, I just
upgraded windows to version 7, my fault…