SW doesn't open files directly from Windows Explorer

Hi Guys,

Since we installed the SW 2013 here, all the computers don't open files (parts, assemblies and drawings) directly from Windows Explorer by double click or right button and open.

This is the error that are shown.

Anybody know how to fix it? It's really boring to drag the files to SW windows every time to open the files.

Thanks

SolidworksUser Interface