One of the first things I heard about Linux is that it doesn't get any kind of malware. Now, I see it can get malware through WINE and e-mail (although I don't even open attachments or follow links from entities I don't know). So, as far as this goes, one simply should use common sense regarding e-mail, and chose carefully what to run on WINE (and possibly use a separate account for it).
Linux is further protected by the fact that all files are set to not be executable, so even if you get malware, it can't execute. This is what I used to think, but it turns out that in KDE and Gnome environments (according to what I read; it's from 2009, so I don't know if it also happens elsewhere or if it was fixed) have special treatment for something called "launchers", that can only have one command, but this may run a malicious script.
I'd like to know exactly why (if) launchers get special treatment (today and in 2009), how do they look on the terminal (do they seem normal files; what happens if you enter
ls -l, etc.), and if this has received any attention from the developers of these platforms.