21. Do not archive your post as a self-extracting executable
Granted (Win)RAR can open your 'exe' post just like a regular '.rar' from the *File / Open...* menu, but it is still not advisable to compress your posts as self-extracting executables. The most obvious reason why are worries about viruses -- no one wants to *run* your post by mistake...just in case. It should also be noted that some binary downloading programs filter out 'exe' attachments by default (Newbin for instance), hence your initial Part may not even be seen.