Re: Who doesn't show hidden files?
Most people don't. Most new users don't even know what a file type is. Oh, they recognize a PDF, all right - by the icon. Just like the icon will tell them if it's an Excel file or whatever else they use on a daily basis.
Hiding the extension has been a Microsoft default since Windows 98, if I'm not mistaken, and that abysmally stupid decision has given malware writers years of fun and years more are to come.