Guild Wars 2 Beta

Yesterday I received a mail inviting me to sign up for the Guild Wars 2 Beta. Hmmm, with so many games and so long development times I can't even remember whether I signed up for such an e-mail alert. So when I click the link and am asked to download and run Scannertron.exe to scan my system, I am naturally suspicious. But going manually to the Guild Wars 2 website I end up with the same request. And googling for Scannertron.exe doesn't give any special virus warnings. So I decided the thing must be legit and signed up for the beta.