9-slice scaling of symbols error message in Adobe Illustrator CS6

When I try to open .eps vector files in Adobe Illustrator CS6 I get an error message which starts with constatating that Illustrator now honors 9-slice scaling of symbols. Then bla-bla-bla… And then it asks me whether I want to retain this option for symbols. I’m 99% certain I don’t need that, but I’m unsure what to answer - YES or NO.
I think I should press NO, but I’m not so sure…