It appears Steven updated the link. Not getting a false positive anymore.
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On mine personally, I'm getting a "Trojan:Win32/Fethar.B!cl" notification. Which is very odd indeed. I'll just try updating definitions again later and see if that fixes it.
EDIT: It seems being even one definition update behind seems to cause that false positive, at least on Windows Defender. Doesn't pop up again after it is updated, thankfully.
You could use MP3DirectCut to edit the file and make the hidden track a separate file.