Why in the h&** does a user have to identify an ever changing array of file extensions in order to carry out the task at hand when all they are trying to do is answer some email or run some mail labels?
Technology is supposed to enable, not disable.
You just read why you have to ID extensions. There are probably less than a half dozen you should ever see in your email. Ask a technically inclined co-worker what they are. Then if you don't recognize one, ask first. It's not that hard. Besides, technology is, always has been, and always will be a dual edged sword.
Well, as I say, think of it as evolution in action...
Seriously, it's not that hard to remember a few acronyms, is it? .doc,(obvious) .pdf (public data format, you'll need Adobe Acrobat or similar) or .txt (text only format) for a document, .jpg and .gif are picture files, .zip means it's compressed, .exe (for executable) is a program, .html for a web page. Basically, never open any .exe . If you don't know what it is, don't open it. I don't think I've ever heard of. Mostly the only ones you'll see in emails are .doc, .gif or .jpg, or .exe when the virus comes through.