Responsys - way to pass campaign folder through CED files?

Hi all!

I have two questions, both about accessing the campaign folder name. We use a third-party BI tool to aggregate all of our data sources - email, call center, website, etc - and for Responsys' part, we export email behavior data using the CED files. One thing (among others) that is missing from those files is the folder name that the campaign is housed in. My over-arching question is "How do we get the folder name out of Responsys and to our third-party BI tool as seamlessly as possible?"

The second part of the question is what exactly is the "external campaign code" on campaign settings for? I was reading in the documents they are for CED files, but could not find a ton of information about it, such as - can it take RPL or only string/integer or how does it get passed through the CED files. Ideally, if we can't find an easier way we were hoping to populate this field with the folder name or an RPL that pulls the folder name automatically.