R6 EnginedServer.4Dlink not working

I updated to R6 this week. The EnginedServer.4Dlink file is not being recognised on windows 7 but it ok on
win8. Since the update My 2 win7 clients always display the connect dialog but no servers are present They do not connect automatically. They connect okay if I manually enter the details in custom and when I do this the EnginedServer.4Dlink is updated however restarting the client and it does not connect automatically as was previously the case.
Paul

Resolved I was missing the 4D extensions folder in the built client