Of course, I saw that you use different files depending on a previous answer.
Do it here the same way  using ExpressionScript/Manger.
 

And, to add:
As you might have seen in the workaround section of the manual there are three ways to include the objects:

1. array
2. csv file
   to make it dependend on a previous question (N1), e.g. 
   var url = "/upload/surveys/{SID}/files/names{N1}.csv";
3. querying a database.

This last also might be interesting for your approach.

[url] www.limesurvey.org/manual/Workarounds:_M...r_LimeSurvey_2.05.2B [/url]

Joffm