Visitor analysis - StatCounter http

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My StatCounter works great, and the visitor analysis is informative. however, recently this referring link has appeared - http://www.statcounter.com/counter/counter.js

What is happening here? Is it someone checking out StatCounter, or is it something sinister. If you click the link it downloads a JScript file of 6k. What is this file?

Thanks in advance for any information.

it's just a mistake on the visitor's browser.