Stimpy - 2013-05-09

We are attempting to deploy new versions (2.10) of pidgin to our windows infrastructure.
Using setup.exe /S it won't install URI handler XMPP. However if you manually run the exe it will install. Pidgin 2.5.8 worked ok.
Is there a switch to specify which URIs to install when installing silently? Or is this a known bug?
It installs other URIs ok, aim yahoo etc.