I'll have to take a look at the original .backup file you are trying to convert from. I'm not exactly sure why it would do that. That's a new error.
Can you email to my @McAfee address and I will check it out?
I have updated listConverter to version 0.9.6.3.
This version allows for the import of binary formatted .der RootCAs in the configuration.
I don't know how they get into the config in the first place, but if they are there, this should properly recognize them and convert them to the proper .pem format for use in MWG7.