However, I might send you a file called pgpkey.txt.exe or pgpkey.txt.bat, and since Windows hides file extensions by default, then it would show up as pgpkey.txt. You double click it and the virus runs.
That's why you should always check what type of file you are opening before you actually open it. Instead of double-clicking on it, right click and go to
properties. Under the
general tab you will see
type of file. Even if the file is a .bat or an .exe disguised as a .txt, your system should show you what it really is. Unless those who are creating malware have found a way around this as well, this should work.