After contacting the support I experienced that the dll connector is developed futhermore.
The fields that are not available are from a newer version of salesforce.
The alternative connector that should be use is the
QlikvView SalesForce Connector 1.50.00001 in Eglish
Do NOT use the other connectors (that is what the lady from the support told me).
The difference to the DLL connector is that it runs via ODBC - in my eyes not a suitable solution.
For me this connector is not running on 64 bit windows 2003 server, but maybe you have more luck. On my 32 bit laptop with windows xp is is running, but not very good (Sometimes errormessages or qlikview hang up).