Shoutbox

So you basically can't be bothered to update a file in a ZIP archive? How lazy are you?
And there's a damn good reason you can't open EXEs from Messenger - malicious code! Have you thought about that?

At the end of the day, your method works, but it's complicated, hard for non-techies to understand, and just plain isn't the best way if doing it. I myself use SPNG to remove the file extension blocker, because I find it simple and easy to use - check one box, and you're done.