It's open source, you could always check. Having the source isn't necessarily enough: http://scienceblogs.com/goodmath/2007/04/strange_loops_dennis_ritchie_a.php It's not malicious though. Dunno why Chrome would say that. Well, probably not. But then Chrome probably had its reasons for saying it wa...

... when I download it. Any idea why this might happen?

How do I re-assure myself that it is not malicious? are there keys/checksums I can verify?

(It's the first time Chrome has said this for any file I've downloaded)