At best the mime type in the file attributes would also be a hint (since there are many situations where it could be lost or not specified at all). So, what ma

At best the mime type in the file attributes would also be a hint (since there are many situations where it could be lost or not specified at all). So, what makes it a better hint than file extensions? If you see an extension you don't recognize, why is that any worse of a signal than a mime type you don't recognize?