Unblock Attatchments in OutLook

Outlook by default block a number of file types. (CMD, EXE, BAT)
To prevent this annoying behaviour if you have an attatchment that you want to open add teh following registry key

HKCU\Software\Microsoft\Office\xx\Outlook\Security
Add a String Key called Level1Remove
Set this key to the extensions your require (semi-colan delimited)

eg. .CMD