Happened to me once or twice when I was trying to download an image from a random site for the first time on Canary. I don't know why it's happening but I do know that it's pretty much possible to include codes/malware inside an image file, without corrupting the image itself.
Yeah, it is possible. But I'm curious if it flags every single PNG? The same can happen to JPG's (and maybe other image file types??) but I don't see them getting flagged. Just kind of strange how they determine which ones to flag and which ones not to. Maybe an MS Rep can help us understand?