do not click on markdown
in notepad. It's ok to click on markdown here in your brower because I'm just letting you know not to click on markdown 
I'm not a tech guy so I don't know why I - cough - clicked the link. I assumed I wouldn't be able to understand anything. But after taking a ~10 second gander at the page I saw this and it made me laugh.
How could an attacker exploit this vulnerability?
An attacker could trick a user into clicking a malicious link inside a Markdown file opened in Notepad, causing the application to launch unverified protocols that load and execute remote files.