StartWebLogic: \xxx was unexpected at this time

Just installed weblogic 12c with an initial domain on windows.
When running startweblogic in the domain i get an error
\xxx was unexpected at this time 

WebLogic seems to stumble over some stuff in my CLASSPATH. Mine 
has jars for the Belgium identity Card in it (others had a problem with QuickTime: QTJava.zip).

Easiest solution is the cleean my classpath, but then other applications will have problems.

After the SETLOCAL line in the startWebLogic.cmd and stopWeblogic.cmd in my domain, I added a line
set CLASSPATH=

Now it starts fine. Updating all these scripts is not the ideal solution however.