Outlook 2013 Security Settings in the registry

Outlook 2013 saves the security settings in the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles\<profile name>\ c02ebc5353d9cd11975200aa004ae40e\11020355.

I noticed that the format of11020355 value is changed. Comparing with the previous version, there are extra bytes at the beginning of the value. I needs to parse this value. What is the change in Outlook 2013?

Thanks.