I tried to add a new driver through Driver Manager:

So far it looks ok. But if I try to save the new driver DBeaver complains:

The details say:
Can't load driver class 'de.hybris.vjdbc.VirtualDriver'
org/apache/log4j/Logger
org.apache.log4j.Logger
I tried with the 64bit and 32bit version of DBeaver, OS is Win7 Professional 64. The same driver / jar works fine on Win XP using DBeaver 32bit and it works also in DBVisualizer.
Any help is welcome.
Lorenz