The default script for the Car demo from A7 Trial located in the GStudio7/projects/carlevel directory is
main.c. And the default level name is
loop.wmb, but I have no problems running either the wmb file from WED or the lite-c script from SED. So again, tell me exactly your steps or upload a demo project that demonstrates the situation.

Remember that there might be some kind of bug in A7.05 V6.835 Trial version? I really can't tell because i'm using the current
A7.06 V6.84 Trial from the Conitec download page to find out what could be your problem.