That's just Microsoft being pissy about a file that hasn't seen a lot of downloads yet.
Note the hideously vile descriptions like "Unrecognized app" and "
might put your PC
blah, blah, blah." Not one word about strange behavior or malicious code. Just "
we don't know what this is so we're going to scare you needlessly."
All you needed to do was click the teeny, tiny, ambiguously worded "More info" link to get around the the warning.