Its not just creating a trusted document, but a trusted location, same as if you went into security settings to do it. I was just suggesting a "settings" form where you could create this location and remove if the user/admin/whatever decides. With windows security settings, its best to give an option to put the settings back as you found them. Not difficult, it could be as simple as a tick box. However, if you prefer you could have some startup code that just implements it to start with. User will still have to trust the project for the first time, to get the code to run. Or an installer can do it. Or numerous other ways to implement it. Whats your preference?