Microsoft is claiming to be able to tell if a file is signed, and warn if it is not. They found out 2 years ago that this functionality has a problem. If they

Microsoft is claiming to be able to tell if a file is signed, and warn if it is not. They found out 2 years ago that this functionality has a problem. If they turned around and released a report saying they know it doesn't work for jar files, then they shouldn't be liable, but they didn't do that.